Therefore, there are $2^{10} = 1024$ different ways that the group of 10 Caltech students can go to lunch at Lake Street, either choosing Chipotle or Panda Express.
To solve this problem, we can use the fundamental principle of counting, also known as the multiplication principle.
For the first student, there are two choices - either Chipotle or Panda Express. Similarly, for the second student, there are two choices, and so on. Therefore, the total number of ways that the group of 10 students can go to lunch is simply the product of the number of choices for each student:
$2 \times 2 \times 2 \times \dots \times 2$ (10 times)
This can be simplified using exponential notation as $2^{10}$.
It is worth noting that if the group were to split up and some students went to Chipotle while others went to Panda Express, then the number of ways would be different and would require a different approach to solve. But since the problem specifies that each student goes to either Chipotle or Panda Express, we can use the multiplication principle to find the answer.
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the national health and nutrition examination survey (nhanes) reported that in a recent year, the mean serum cholesterol level for u.s. adults was 202, with a standard deviation of 41 (the units are milligrams per deciliter). a random sample of 100 adults is chosen. what is the probability that the sample mean cholesterol level is less than 190?
Therefore, the probability that the sample mean cholesterol level is less than 190 is approximately 0.23%.
We can use the central limit theorem to approximate the distribution of the sample mean cholesterol level as normal with a mean of 202 and a standard deviation of 41/sqrt(100) = 4.1.
To find the probability that the sample mean cholesterol level is less than 190, we can standardize the sample mean using the formula:
z = (x - mu) / (sigma / sqrt(n))
where x is the sample mean, mu is the population mean, sigma is the population standard deviation, and n is the sample size.
Plugging in the values, we get:
z = (190 - 202) / (4.1) = -2.93
Now we can use a standard normal distribution table or calculator to find the probability that a standard normal random variable is less than -2.93. The probability is approximately 0.0023 or 0.23%.
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Help me please! Will give brainliest if the option is available
answer
(1.2, 1) if its asking what i think it is
Step-by-step explanation:
1) A savings account balance is compounded
annually. If the interest rate is 2.1% per
year and the current balance is $1,777.00,
what will the balance be 10 years from
now?
The total balance in the savings account after 10 years will be $2,187.48.
What is the accrued amount after 10 years?The formula accrued amount in a compounded interest is expressed as;
[tex]A = P(1 + \frac{r}{n} )^{(n*t)}[/tex]
Where A is accrued amount, P is principal, r is interest rate and t is time.
Given that:
Principal P = $1,777Compounded annually n = 1Time t = 10 yearsInterest rate r = 12.1%Accrued amount A = ?First, convert R as a percent to r as a decimal
r = R/100
r = 2.1/100
r = 0.021
Now, plug the values into the above formula and simplify.
[tex]A = P(1 + \frac{r}{n} )^{(n*t)}\\\\A = 1,777(1 + \frac{0.021}{1} )^{(1*10)}\\\\A = 1,777(1 +0.021 )^{(10)}\\\\A = 1,777(1.021 )^{(10)}\\\\A = 2,187.48[/tex]
Therefore, the accrued amount is $2,187.48.
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The sum of the squares of two consecutive positive integers is 340. find the integers. 
Solve the equation. Enter your answer as an equation that shows the value of
the variable (like s = 2/3, or 4= w).
-3x+x-5= 25
-15 is the value of the variable x in the given equation -3x+x-5= 25
The given equation is -3x+x-5= 25
Minus three times of x plus x minus five equal to twenty five
x is the variable in the equation
Minus and plus are the operators
Combine the like terms in the equation
-2x-5=25
Add 5 on both sides
-2x=30
x=-15
Hence, the value of x in the equation is -15
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a globe of the world if it's snuggling inside a transparent display Cube the length of an edge of the cube is 5.4 in is the Globes volume greater than less than or equal to 5.4 cubed cubic inches?
The volume of the cube is greater than 5.4 cubic inches.
How to obtain the volume of a cube?The volume of a cube of side length a is given by the cube of the side length, as follows:
V = a³.
The side length in the context of this problem is given as follows:
a = 5.4 in.
Hence the volume of the cube is given as follows:
V = 5.4³
V = 157.5 cubic inches.
(to obtain the volume of the cube, we apply the formula obtaining the cube of the side length).
157.5 > 5.4, hence the volume of the cube is greater than 5.4 cubic inches.
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the null hypothesis for the single factor anova states that all means are equal.
T/F
The null hypothesis for the single factor ANOVA states that all means are equally true.
The null hypothesis for a single-factor ANOVA (analysis of variance) states that all means are equal.
The alternative hypothesis, on the other hand, suggests that at least one of the means is different from the others.
The purpose of the ANOVA test is to determine whether there is sufficient evidence to reject the null hypothesis and conclude that there are significant differences between the means. A statistical formula used to compare variances across the means (or average) of different groups.
Hence, the statement is true .
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3. Is it possible to solve x (t ) for t, substitute it into y(t) to eliminate the parameter, t, and write it as a rectangular equation with x and y instead? x(t)=0. 5507t^2-1. 5393t-86. 1
Yes, it is possible to solve x(t) for t and substitute it into y(t) to eliminate the parameter t and write it as a rectangular equation with x and y instead.
Starting with the given equation:
x(t) = 0.5507t^2 - 1.5393t - 86.1
To solve for t, we can use the quadratic formula:
t = [-(-1.5393) ± sqrt((-1.5393)^2 - 4(0.5507)(-86.1))]/(2(0.5507))
Simplifying the equation:
t = [1.5393 ± sqrt(1.5393^2 + 190.2122)]/1.1014
t = [1.5393 ± 13.9769]/1.1014
t = -11.098 or 25.682
Since we're interested in the positive value of t, t = 25.682.
Now, substituting t = 25.682 into y(t):
y(t) = 0.5054t - 78.9
y(25.682) = 0.5054(25.682) - 78.9
y(25.682) = 1.504
Therefore, the rectangular equation for the given parametric equations is:
x = 0.5507t^2 - 1.5393t - 86.1
y = 0.5054t - 78.9
Substituting t = 25.682:
x = 358.6
y = 1.504
So the rectangular equation is:
(x, y) = (358.6, 1.504)
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Find the probability​ P(E or​ F) if E and F are mutually​ exclusive, ​P(E)=0.34​, and ​P(F)=0.51.
The probability of either event E or event F occurring, when E and F are mutually exclusive, is 0.85.
If E and F are mutually exclusive events, it means that they cannot occur simultaneously. In such cases, the probability of either event E or event F occurring is the sum of their individual probabilities.
Given that P(E) = 0.34 and P(F) = 0.51, we can calculate the probability of E or F, denoted as P(E or F), as:
P(E or F) = P(E) + P(F)
Substituting the given values, we have:
P(E or F) = 0.34 + 0.51
Calculating the sum, we find:
P(E or F) = 0.85
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Two observers A and B, 500 m apart, observed a kite in the same vertical plane and from the same side of the kite the angles of elevation of the kite are 30 and 20 respectively Find the height of the kite, disregarding the height of the observer.
The trigonometric ratios for tangent indicates that the height of the kite, where the distance between the observers is 500 m, and the angle of elevation are 30° and 20° is h ≈ 492.4 meters
What are trigonometric ratios?Trigonometric ratios are mathematical functions that express the relationships between an interior angle of a right triangle and two of the sides of the triangle.
The distance between the two observers = 500 m
The angle of observation of the kite by each of the two observers = 30° and 20°
Let h represent the height of the kite, and let x represent the horizontal distance from the kite to the closer observer (The observer observing with an angle of elevation of 30°), we get;
The horizontal distance from the kite to the other observer = x + 500
Therefore, according to the trigonometric ratios for tangent;
tan(20°) = h/(x + 500)
tan(30°) = h/x
h = x × tan(30°)
Therefore;
tan(20°) = (x × tan(30°))/(x + 500)
(x + 500) × tan(20°) = x × tan(30°)
(x + 500) × 0.36397 = x × (1/(√3))
0.36397·x + 500 × 0.36397 = x/√3
x/√3 - 0.36397·x = 500 × 0.36397 = 181.985
x·(1/√3 - 0.36397) = 181.985
x = 181.985/((1/√3 - 0.36397))
h = 181.985/((1/√3 - 0.36397)) × tan(30°)
h = 181.985/((1/√3 - 0.36397)) × (1/√3) ≈ 492.4
The height of the kite, h ≈ 492.4 meters
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a) Complete
the table of values for y=x²-2x-3
b) i) Which of the three curves drawn
matches y = x² - 2x - 3?
ii) Estimate the value of y
when x = 2.5
iii) Find the values of x
when y = 1
b)i) The curve that matches y = x² - 2x - 3 is the middle one, which is a parabola opening upward. b)ii) we can estimate that y(2.5) ≈ y(2) + 3/2 = -3 + 3/2 = -1.5. b)iii) the only value of x when y = 1 is x = 2.
Answers to the aforementioned questionsa)
| x | y
| -3 | 12
| -2 | 1
| -1 | -4
| 0 | -3
| 1 | -2
| 2 | -3
| 3 | 0
b) i) The curve that matches y = x² - 2x - 3 is the middle one, which is a parabola opening upward.
ii) To estimate the value of y when x = 2.5, we can use the values of y when x = 2 and x = 3 to find the average rate of change, and then add or subtract that from the value of y when x = 2 or x = 3, respectively.
Using x = 2 and x = 3, we have:
Average rate of change = (y(3) - y(2)) / (3 - 2) = 3
So we can estimate that y(2.5) ≈ y(2) + 3/2 = -3 + 3/2 = -1.5.
iii) To find the values of x when y = 1, we can set y = 1 in the equation y = x² - 2x - 3 and solve for x:
x² - 2x - 3 = 1
x² - 2x - 4 = 0
(x - 2)² = 0
x - 2 = 0
x = 2
So the only value of x when y = 1 is x = 2.
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How long would you need to save $3400 in the account with .12% interest rate compounded continuously to end up with $5000 
Answer: To determine the time it would take to save $3400 in an account with a 0.12% interest rate compounded continuously to end up with $5000, we can use the continuous compound interest formula:
A = Pe^(rt)
Where:
A = the final amount in the account ($5000 in this case)
P = the initial amount in the account ($3400 in this case)
e = the mathematical constant e (approximately equal to 2.71828)
r = the annual interest rate (0.12% = 0.0012 as a decimal)
t = the time in years
We can rearrange this formula to solve for t:
t = ln(A/P) / r
Substituting the values given, we get:
t = ln(5000/3400) / 0.0012
t = 28.58 years (rounded to two decimal places)
Therefore, it would take approximately 28.58 years to save $3400 in an account with a 0.12% interest rate compounded continuously to end up with $5000.
Step-by-step explanation:
The spinner below is spun once. Find each probability as a percent rounded to the nearest whole number.
P(unshaded) = __%
P(even and less than 10) =__ %
The probabilities are given as follows:
P(unshaded) = 33%.P(even and less than 10) = 33%.How to calculate a probability?The parameters that are needed to calculate a probability are given as follows:
Number of desired outcomes in the context of a problem/experiment.Number of total outcomes in the context of a problem/experiment.Then the probability is calculated as the division of the number of desired outcomes by the number of total outcomes.
Out of the 12 regions, 4 are unshaded, hence the probability is given as follows:
P(unshaded) = 4/12 = 1/3 = 0.33 = 33%.
Out of the 12 regions, 4 are even and less than 10, hence the probability is given as follows:
P(even and less than 10) = 4/12 = 1/3 = 0.33 = 33%.
Missing InformationThe spinner is given by the image presented at the end of the answer.
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In a circle with radius 4.5, an angle measuring 1 radians intercepts an arc. Find the length of the arc to the nearest 10th.
The length of the arc is approximately 4.5 to the nearest 10th.
How to solve for the length of the arcTo find the length of the arc intercepted by an angle in a circle, we can use the formula:
Arc length = radius × angle (in radians)
In this case, the radius is 4.5, and the angle is 1 radian. So, we can calculate the arc length as follows:
Arc length = 4.5 × 1 ≈ 4.5
Therefore, the length of the arc is approximately 4.5 to the nearest 10th.
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Janet's Athletic Company makes basketballs and is shipping them to a company that has round containers with a volume of 208,592. How many basketballs can they ship if each basketball has a volume of 13906
Janet's Athletic Company can ship 15 basketballs in the round containers with a volume of 208,592.
To figure out how many basketballs Janet's Athletic Company can ship, we need to divide the volume of the round containers by the volume of each basketball. So we can set up the following equation:
Number of basketballs = Volume of round containers / Volume of each basketball
Plugging in the given values, we get:
Number of basketballs = 208,592 / 13906
Simplifying the division, we get:
Number of basketballs = 15
Therefore, Janet's Athletic Company can ship 15 basketballs in the round containers with a volume of 208,592.
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27) Find the point that is one-fourth of the way
from (2, 4) to (10, 8).
so hmmm let's call them P(2, 4) and Q(10, 8)
[tex]\textit{internal division of a segment using a fraction}\\\\ P(\stackrel{x_1}{2}~,~\stackrel{y_1}{4})\qquad Q(\stackrel{x_2}{10}~,~\stackrel{y_2}{8})~\hspace{8em} \frac{1}{4}\textit{ of the way from P to Q} \\\\[-0.35em] ~\dotfill[/tex]
[tex](\stackrel{x_2}{10}-\stackrel{x_1}{2}~~,~~ \stackrel{y_2}{8}-\stackrel{y_1}{4})\qquad \implies \qquad \stackrel{\stackrel{\textit{component form of}}{\textit{segment PQ}}}{\left( 8 ~~,~~ 4 \right)} \\\\[-0.35em] ~\dotfill\\\\ \left( \stackrel{x_1}{2}~~+~~\frac{1}{4}(8)~~,~~\stackrel{y_1}{4}~~+~~\frac{1}{4}(4) \right) \implies \boxed{(4~~,~~5)}[/tex]
A triangle has two side lengths of 6.5 inches and 2.75 inches. Which of the following side lengths could be the third side?
A.) 2.5 inches
B.) 3.75 inches
C.) 5.5 inches
D.) 9.25 inches
Answer:
9.25 inches
Step-by-step explanation:
9.25 inches
the price of a gallon of milk follows a normal distribution with a mean of $3.4 and a standard deviation of $0.2. find the price for which only 35% of milk vendors lower than?
Answer: $3.32
Step-by-step explanation:
-0.3853 = (x - 3.4) / 0.2
Solving for x, we get:
X = 3.32
Therefore, the price for which only 35% of milk vendors is lower than $3.32.
1.1-8. during a visit to a primary care physician's office, the probability of having neither lab work nor referral to a specialist is 0.21. of those coming to that office, the prob- ability of having lab work is 0.41 and the probability of having a referral is 0.53. what is the probability of having both lab work and a referral?
The probability of having both lab work and a referral during a visit to a primary care physician's office is 0.16 or 16%.
To find the probability of having both lab work and a referral, we can use the formula P(A and B) = P(A) + P(B) - P(A or B), where A and B are events and P is the probability of those events occurring.
Let A be the event of having lab work and B be the event of having a referral.
We know that P(A) = 0.41, P(B) = 0.53, and P(neither A nor B) = 0.21.
To find P(A or B), we can use the formula P(A or B) = P(A) + P(B) - P(A and B). We don't know P(A and B), but we can find it by using the fact that P(neither A nor B) = 0.21:
P(A or B) = P(A) + P(B) - P(A and B)
1 - P(neither A nor B) = P(A) + P(B) - P(A and B)
1 - 0.21 = 0.41 + 0.53 - P(A and B)
0.78 = 0.94 - P(A and B)
P(A and B) = 0.16
Therefore, the probability of having both lab work and a referral is 0.16.
The probability of having both lab work and a referral during a visit to a primary care physician's office can be found using the formula P(A and B) = P(A) + P(B) - P(A or B). Given that the probability of having lab work is 0.41, the probability of having a referral is 0.53, and the probability of having neither is 0.21, we can solve for P(A and B) and get a probability of 0.16. This means that there is a 16% chance of a patient having both lab work and a referral during their visit.
In conclusion, the probability of having both lab work and a referral during a visit to a primary care physician's office is 0.16 or 16%. This calculation was done using the formula P(A and B) = P(A) + P(B) - P(A or B), with the probabilities of having lab work, a referral, and neither being given.
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true or false: the general fertility rate refers to the number of live births reported in an area during a given time interval divided by the number of women age 15 to 44 years in the area. group of answer choices true false
The general fertility rate refers to the number of live births reported in an area during a given time interval divided by the number of women age 15 to 44 years in the area is false
The general fertility rate refers to the number of live births reported in an area during a given time interval per 1,000 women of reproductive age (usually defined as 15 to 44 years old) in the same area.
Therefore, it is a rate or a ratio that expresses the number of births in relation to the number of women of reproductive age in a population.
Hence, the statement is False that the general fertility rate refers to the number of live births reported in an area during a given time interval divided by the number of women age 15 to 44 years in the area is false
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URGENT!! Will give brainliest :)
A line of best fit was drawn for 6 data points. What is the maximum number of these data points that may not actually be on the line?
• A. 6
О B. 3
O c. 5
O D. 4
The maximum number of points that may not be on the line is given as follows:
A. 6.
How to find the equation of linear regression?To find the regression equation, which is also called called line of best fit or least squares regression equation, we need to insert the points (x,y) in a linear regression calculator.
When we insert the points on a calculator, we get a linear function that is obtained using the mean and sum of squares of the points. This means that the line has on average the least distance to the points, but it can happen that none of the points is exactly on the line.
Hence option A is the correct option in the context of this problem.
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To indirectly measure the distance across a lake, Moussa makes use of a couple landmarks at points
�
P and
�
Q. He measures
�
�
OS,
�
�
SQ, and
�
�
RS as marked. Find the distance across the lake
(
�
�
)
(PQ), rounding your answer to the nearest hundredth of a meter.
The distance across the lake PQ will be 496.8 meters.
Given that:
Sides, OS = 210 m, SQ = 70 m, and RS = 124.2 m
The ratio of the matching sides will remain constant if two triangles are comparable to one another.
The distance across the lake PQ is calculated as,
PQ / RS = OQ / SQ
PQ / 124.2 = (210 + 70) / 70
PQ / 124.2 = 280 / 70
PQ = 496.8 m
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An closed box with a square base is to have a volume of 7500 cm3. What should the dimensions of the box be if the amount of material used is to be minimum? (Use decimal notation. Give your answers to three decimal places. ) Recall: The surface area of a rectangular box is: =2⋅⋅+2⋅⋅ℎ+2⋅⋅ℎ , where = length, = width, and ℎ= height. Hint: Draw a sketch of the box and note that the base of the box is a square
To minimize the amount of material used for the box, we want to minimize its surface area. Since the base of the box is a square, let's denote its side length as s. Then, the height of the box can be expressed as 7500/s^2, using the given volume.
Using this information, we can express the surface area of the box as a function of s: A(s) = 2s^2 + 4sh, where h is the height of the box. Substituting 7500/s^2 for h, we get A(s) = 2s^2 + 4(7500/s^2)s.
To find the minimum amount of material used, we need to find the value of s that minimizes A(s). We can do this by finding the critical points of A(s) and then using the second derivative test to determine if they correspond to a minimum. Taking the derivative of A(s) and setting it equal to zero, we get:
A'(s) = 4s - 30000/s^3 = 0
Solving for s, we get s = 15∛125 ≈ 12.247.
To confirm that this value corresponds to a minimum, we take the second derivative of A(s) and evaluate it at s = 12.247:
A''(s) = 4 + 90000/s^4
A''(12.247) ≈ 0.143
Since A''(12.247) is positive, we can conclude that s = 12.247 corresponds to a minimum of A(s). Therefore, the of the box should be approximately 12.247 cm by 12.247 cm by 41.666 cm to minimize the amount of material used.
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Find an angle in each quadrant with a common reference angle with 53°, from 0°≤θ<360°
The angle of 53° is equals to,
53° in the first quadrant127° in the second quadrant 233° in the third quadrant307° in the fourth quadrant.The given angle = 53°
The given angle is present in the first quadrant only. To find the equivalent angle in the second quadrant, we have to subtract the given angle from 180°. So,the equivalent angle in the second quadrant = 180° - 53° = 127°.
To find the equivalent angle in the third quadrant, we have to add the given angle to 180°. So,equivalent angle in third quadrant = 180° + 53° = 233°.
To find the equivalent angle in the fourth quadrant, we have to subtract the given angle from 360°. So,equivalent angle in fouth quadrant = 360° - 53° = 307°.
From the above analysis, we have found the equivalent angles in all quadrants.
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After heating up in a teapot, a cup of hot water is poured at a temperature of 20 3 ∘ 203 ∘ F. The cup sits to cool in a room at a temperature of 6 9 ∘ 69 ∘ F. Newton's Law of Cooling explains that the temperature of the cup of water will decrease proportionally to the difference between the temperature of the water and the temperature of the room, as given by the formula below: � = � � + ( � 0 − � � ) � − � � T=T a +(T 0 −T a )e −kt � � = T a = the temperature surrounding the object � 0 = T 0 = the initial temperature of the object � = t= the time in minutes � = T= the temperature of the object after � t minutes � = k= decay constant The cup of water reaches the temperature of 18 5 ∘ 185 ∘ F after 1.5 minutes. Using this information, find the value of � k, to the nearest thousandth. Use the resulting equation to determine the Fahrenheit temperature of the cup of water, to the nearest degree, after 4.5 minutes. Enter only the final temperature into the input box.
The final temperature is 165 degree F.
Given that,
Ta = the temperature surrounding the object = 69ºF
T₀ = the initial temperature of the object = 203ºF
t = 1.5 min
T after 1.5 min = 185ºF
We know the temperature equation,
T = [tex]T_{\alpha}[/tex] + [tex](T_{0} - T_{\alpha })e^{-kt}[/tex]
Substitute the values,
185 = 69 + (203 - 69)[tex]e^{-1.5k}[/tex]
solving it we get
k = 0.077
To find the Fahrenheit temperature of the cup of water, to the nearest degree, after 4. minutes.
Substitute into the formula and compute:
T = 69 + (203 - 69)[tex]e^{-(0.75)(4.5)}[/tex]
Hence,
T = 165 degree F.
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Part A: Cassie hiked 4 tenths of a 4.7-mile trail. How many miles did Cassle have left to hike?
Part B: Dana was 1.6 miles ahead of Cassie. How many miles did Dana hike already?
The distance left to hike by Cassius is equal to 1.44 miles . Dana hiked 3.5986 miles
We are given that Cassie hiked 4 tenths of a 4.7-mile trail and Dana was 1.6 miles ahead of Cassie.
Since Cassius walked 6/10th of the trail of 3.6 miles.
Part of the trail remaining = 1 - 6/10 = 4/10 = 2/5
Distance remaining will be 2/5 of 3.6 miles
= 1.44 miles.
Hence distance left to hike by Cassius = 1.44 miles
b. Total distance by which Dana was ahead of Cassius = 1.6miles.
Distance left to hike by Dana= 1.44 miles - 1.6 miles = 0.0014 miles.
so, the distance hiked by Dana= 3.6 miles - 0.0014 miles = 3.5986 miles.
Dana hiked 3.5986 miles.
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Answer ASAP (for pre-algebra notes)
Triangle XYZ is similar to triangle JKL.
Determine the length of side LJ.
The length of side LJ is equal to 11.48 units.
What are the properties of similar triangles?In Mathematics and Geometry, two (2) triangles are only similar when the ratio of their corresponding side lengths are equal and their corresponding angles are congruent.
Based on the diagram, we can logically deduce the following proportion based on the congruent sides:
XY/JK = YZ/KL = ZX/LJ
8.7/12.18 = 8.2/LJ = 7.8/KL
By cross-multiplying and solving for the length of side LJ, we have the following:
LJ = (12.18 × 8.2)/8.7
LJ = 11.48 units.
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Christine went to mall at 11:30 am they shopped for 5 hours 35 minutes. What time did they finish shopping?
Answer:
5:05 PM
Step-by-step explanation:
Use a time calculator.
Answer:5:05pm
Step-by-step explanation:
It might be easier to split up the 5 hours and 35 min in minutes and hours
11:30 + 5 hours = 4:30pm
There is still 35 minutes left.
4:30 + 35 min = 5:05pm
∴, Christine finished shopping at 5:05pm
Given that x is a midsegment in the
triangle below, find its length.
6480
X
16
18
X = [?]
Answer:
x=9
Step-by-step explanation:
Since x is a midsegment this means that it bisects the side with a length of 16. Now using ratio and proportion between the large triangle and the small triangle to find the length of x you have to do
18/16=x/(16/2)
16x=18(8)
x= 144/16
x=9
29. The ratio of the surface areas of two spheres is 1:9.
a. What is the ratio of the lengths of their radii? What is the
ratio of their volumes?
b. If the volume of the smaller sphere is 64 cubic inches, what
is the volume of the larger sphere?
Answer:
a) 1 : 3 and 1 : 27. b) 1728 inches³
Step-by-step explanation:
a) if ratio of areas is 1:9, then the ratio of lengths is √1 : √9 = 1:3
ratio of volumes is 1³ : 3³ = 1 : 27
b) volume of smaller = 64.
ratio of volumes = 1 : 27
volume of larger sphere = 27 X 64 = 1728 (inches³)
