Okay so, this is my friends work, I completely failed 8th and am trying to relearn and help lol, I know Pie times 25 equals 78.5, is the area of one circle, and twice that is 2 circles, I dont even know if thats wrong or right and my dad will yell at me if I even have 1 digit off, so Im completely hopeless and am desperate for help. (Added Photo)
Answers
Answer:
1. a) rectangle, circles.
1. b) circumference.
2. half.
3. 2πr² + 2πrh
4. See below.
Step-by-step explanation:
Question 1a) The net of a cylinder is made up of one rectangle and two circles.
b) The width of the rectangle in the net of a cylinder is equal to the circumference of the circle.
Question 2The radius of a circle is half the diameter.
Question 3[tex]\textsf{Circumference of a circle} = \pi d=2 \pi r[/tex]
Therefore, the formula for the surface area of a cylinder is:
[tex]\begin{aligned}\textsf{S.A. of a cylinder}&=\sf 2\;circles+1\;rectangle\\&=2 \pi r^2+2\pi rh\\&=2\pi r(r+h)\end{aligned}[/tex]
where r is the radius of the circle and h is the height of the cylinder.
Note: It appears from the question sheet that they wish you to use π=3.
Also, as you need to estimate the total surface area, round any decimals to their nearest whole number before carrying out any calculations.
Please note that the formula for Area of Rectangle quoted in the example question is incorrect when comparing it to the answer of question 1b. In the formula, it says that the length is equal to the circumference of the circle, whereas in question 1b it states that the width of the rectangle is equal to the circumference. Therefore, I have used the correct formula for the rectangle part of the cylinder:
2r × π × hQuestion 4aGiven:
Radius = 5 cmHeight = 6 cmArea of One Circle
[tex]\begin{aligned} \pi \times r^2&=3 \times (5)^2\\&=3 \times 25\\&=75\; \sf cm^2\end{aligned}[/tex]
Area of Two Circles
[tex]75 \times 2 = 150\; \sf cm^2[/tex]
Area of Rectangle
[tex]\begin{aligned}2r \times \pi \times h&=2(5) \times 3 \times 6\\&=10 \times 3\times 6\\&=30 \times 6\\&=180\; \sf cm^2\end{aligned}[/tex]
Total Surface Area
[tex]\;\;\;\;180+150\\=330\sf \; cm^2[/tex]
Question 4bGiven:
Radius = 6.2 cm ≈ 6 cmHeight = 12.3 cm ≈ 12 cmArea of One Circle
[tex]\begin{aligned} \pi \times r^2&=3 \times (6)^2\\&=3 \times 36\\&=108\; \sf cm^2\end{aligned}[/tex]
Area of Two Circles
[tex]108 \times 2 = 216\; \sf cm^2[/tex]
Area of Rectangle
[tex]\begin{aligned}2r \times \pi \times h&=2(6) \times 3 \times 12\\&=12 \times 3\times 12\\&=36 \times 12\\&=432\; \sf cm^2\end{aligned}[/tex]
Total Surface Area
[tex]\;\;\;\;432+216\\=648 \sf \;cm^2[/tex]
Question 4cGiven:
Radius = 10.7 cm ≈ 11 cmHeight = 17.4 cm ≈ 17 cmArea of One Circle
[tex]\begin{aligned} \pi \times r^2&=3 \times (11)^2\\&=3 \times 121\\&=363\; \sf cm^2\end{aligned}[/tex]
Area of Two Circles
[tex]363\times 2 = 726\; \sf cm^2[/tex]
Area of Rectangle
[tex]\begin{aligned}2r \times \pi \times h&=2(11) \times 3\times 17\\&=22 \times 3 \times 17\\&=66 \times 17\\&=1122\; \sf cm^2\end{aligned}[/tex]
Total Surface Area
[tex]\;\;\;\;1122+726\\=1848\sf \;cm^2[/tex]
Related Questions
The jenkins family drinks 3/4 of a gallon of orange juice every 3 days. How many orange juice do they drink per day?
Answers
Answer:
1/4
Step-by-step explanation:
3/4 divided by 3=1/4
An object of mass 30 kg is in free fall in a vacuum where there is no air resistance. Determine
the acceleration of the object.
Answers
Answer:
a= g=9.81 m/s square
Mass given to us = 30 kg
Therefore we have to find the acceleration of the object,
As there is no air and mass is irrelevant in free fall, the acceleration the object experiences will be equal to the force of gravity. On our planet, the gravitational pull on an item falling there is approximately:
9.81 m/s square.
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can someone help find the volume
Answers
Answer:
the first one 792 ft²
Step-by-step explanation:
you do length times width times height = lxwxh
in a test for particular illness, a false-positive result is obtained about 1 in 125 times the test is administered. if the test is administered to 15000 people, obtain the approximate probability of there being more than 135 false-positive results?
Answers
The probability of being more than 135 false-positive result is equal to 0.0853.
As given in the question,
Probability of false positive 'p' = 1/125
= 0.008
Number of people tested 'sample size n' = 15,000
Mean 'μ' = np
= 15000 × 0.008
= 120
Standard deviation 'σ' = √n × p × ( 1 - p )
= √15000 × 0.008 × ( 1 - 0.008)
=√ 15000 × 0.008 × 0.992
= √119.04
= 10.9
z = (X - μ) /σ
Approximate probability of being more than 135 false-positive results
= P( X > 135)
= P[( X - μ )/σ > ( 135 - μ)/σ
= P ( z > (135 - 120)/ 10.9)
= P ( z > 1.37)
= 1 - P ( z ≤ 1.37)
= 1 - 0.9147
= 0.0853 ( from z table)
Therefore, probability of being more than 135 false-positive results is equal to 0.0853.
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Suppose that you use a pair of chopsticks
and apply a force of 1 are
N over a distance of 0.01 m. How much
work do you do? If the output force of the
chopsticks is only 0.5 N, how far do the tips
of the chopsticks move?
Answers
0.01 N of work is to be done to move the chopsticks to a distance of 0.01 m
0.02m far the tips of the chopsticks move.
What is work done?
Every time a force pushes something over a distance, work is done. By multiplying the force by the distance moved in the force's direction, you may determine the energy transferred, or work done. Energy transmitted equals work done, which is force times the distance travelled in the force's direction.
1. WD = F×d
= 1×0.01
= 0.01 N
2. d = WD/F
= 0.01/(0⋅5)
= 0.02m
0.02m far the tips of the chopsticks move.
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A sine wave is offset 1/6 cycle with respect to time 0. What is its phase in degrees and radians?.
Answers
Its phase is 60 degrees and π/3 radian
From the question, we have
Each complete cycle measures 360 degrees.
So, 1/6 cycle = 1/6 × 360° = 60°
Each complete cycle measures 2π radian.
So, 1/6 cycle = 1/6 × 2π = π/3 radian
Multiplication:
In mathematics, multiplying two or more numbers yields the product of the numbers. One of the basic mathematical operations is one that we commonly perform. The most obvious example is using multiplication tables. Mathematicians multiply two integers to illustrate the process of repeatedly adding one number to another. The types of numbers that can be included include natural numbers, fractions, integers, whole numbers, and others. When M is multiplied by n, it either adds or subtracts from itself 'n' times.
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Use the commutative property to write an equivalent expression to 4g + 13, and show that they are equivalent for g =
10 and g = 2. Complete the statements.
If you change the order of the terms you can create the equivalent expression
and
After substituting 10 for g, the expressions are
After substituting 2 for g, the expressions are 4(2) + 13 and 13 + 4(2).
The expressions are equivalent because they both have a value of
when g = 2.
when g = 10 and a value of
Answers
The equivalent expression by commutative property is,
4g + 13 = 13 + 4g
Commutative property :
According to the commutative property, the numbers we use can be moved around or switched around without changing the result.
a +b =b+a
The given expression is 4g +13
The equivalent expression by the commutative property is
4g +13 = 13 +4g
For g = 10,
4(10) + 13 = 13 + 4(10)
40 +13 = 13 +40
53 = 53
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Can the equation x² = 10 be solved by factoring?
Solve it x = +/-
Answers
The required simplified solution of the given expression is given as ±√10.
Given that,
To determine the simplified solution of x² = 10, by factorization.
The process in mathematics to operate and interpret the function to make the function or expression simple or more understandable is called simplifying and the process is called simplification.
Here,
x² = 10
Taking square root on both sides,
x = ±√10
Thus, the required simplified solution of the given expression is given as ±√10.
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when sample size increases, everything else remaining the same, the width of a confidence interval for a population parameter will:
Answers
when sample size increases, everything else remaining the same, the width of a confidence interval decreases.
The sample size is defined as the the number of observations or participants included in a study.
The confidence interval is defined as the mean of the estimate plus and minus the variation in that estimate. That means when you do the test multiple times, then the value may be vary from the estimated value. The confidence interval is the range of those values.
So when the sample size increases the width of the confidence interval decreases
Hence, when sample size increases, everything else remaining the same, the width of a confidence interval decreases.
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he shoe sizes of a group of middle school girls are shown.
5.5 6 7 8.5 6.5
6.5 8 7.5 8 5
If a shoe size of 6 is added to the data, how does the IQR change?
The IQR becomes a 1.5.
The IQR remains a 2.
The IQR remains a 2.5.
The IQR becomes a 3.
Answers
If a shoe size of 6 is added to the data, there wouldn't be any change in the IQR. Therefore, the correct answer option is: B. the IQR remains a 2.
What is an interquartile range?IQR is an abbreviation for interquartile range and it can be defined as a measure of the middle 50% of data values when they are ordered from lowest to highest.
Mathematically, interquartile range (IQR) is the difference between quartile 1 (Q₁) and quartile 3 (Q₃):
IQR = Q₃ - Q₁
Based on the given data set, the following interquartile ranges was calculated by using Microsoft Excel:
Q₃ = 8Q₁ = 6Now, the interquartile range (IQR) is given by:
IQR = Q₃ - Q₁
IQR = 8 - 2
IQR = 2
Adding a shoe size of 6 to the data set, the first and third and interquartile ranges remained the same, which implies that the interquartile range (IQR) would remain as two (2).
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Answer: The IQR stays the same therefor the option is "the IQR remains a 2."
Step-by-step explanation:
There are 15 girls in your class this year. That is a 15% increase from last year. Write a proportion to solve for the number of girls in the class last year.
Answers
First, we have to recognize that if the current number of girls in the class is a 15% increase from last year, then this year's number is 115% of last year's number.
With that, we can set up a proportion comparing last year to this year, in both percentages and numbers:
[tex]\dfrac{100}{115} = \dfrac{x}{15}[/tex]
Note that both numerators are last year's values and the denominators are this year's values.
If we multiply both sides by 15, we have that x ≈ 13.043478260869565. Since we're dealing with whole people, we'd say that there were 13 girls in the class last year.
Please help I need help with both questions fast
zoom in
5. Does the graph represent a function?
ОО
Yes
No
*REQUIRED
*REQUIRED
6. Explain why the graph is or is not a
function below.
Type response
Answers
Answer:
Below
Step-by-step explanation:
YES function because there is only ONE value of Y for each value of X
Can i get help on this answer pls. 20 points rewarded for correct answer
Answers
Answer: (a) It appears to take the same amount of time to serve each customer. Predicted amount of time to serve 9 customers: 27
(b) Each dollar spent appears to earn the same number of points. 80 points : $8
What is the amount of error that you will accept in the upper tail of the confidence interval?.
Answers
The amount of error that you will accept in the upper tail of the confidence interval as follows
The amount of error that will accept in the upper tail is = 13.97
Amount of error = margin of error
Margin of error = [tex]Z\frac{\alpha }{2} \frac{s}{\sqrt{n} }[/tex]
93% = confidence interval =1- [tex]\alpha[/tex]
=1-.93
=0.07
Hence [tex]\frac{\alpha }{2}[/tex] =0.035
[tex]Z\frac{\alpha }{2} or t\frac{\alpha }{2} = 1.81[/tex]
This problem represents two tail test because a two-tailed test is a method in which the critical area of a distribution is two-sided and tests whether a sample is greater or less than a range of values.
And confidence interval are always two tailed.
So margin of error = [tex]1.81x\frac{1.99}{\sqrt{40} }[/tex]
= 0.57
Upper tail C.I = x + margin of error
=13.4+0.57
=13.97
Lower tail C.I = x - margin of error
= 13.4 - 0.57
=12.83
Hence the answer is, the amount of error that will accept in the upper tail is = 13.97.
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hi help me pls help help
Answers
Step-by-step explanation:
many greetings to your teacher, there are some definitions missing.
this can only be done if JM and LH are true diameters of the circle.
1. if LH is a diameter, then angles KAH + LAK = 180°.
KAH = 90° (right angle).
so,
angle LAK = 180 - 90 = 90°.
2.
with JM and LH being diameters, JAH = LAM = 42°.
JAH + JAK = 90°.
angle JAK = 90 - 42 = 48°.
3. angle LAJ = LAK + JAK = 90 + 48 = 138°.
4. see also 2.
these are angles of intersecting lines (diameters). they must be the same on both sides of such an intersected line (just left-right mirrored).
JAH = LAM = 42°.
5. angle KAM = LAK + LAM = 90 + 42 = 132°.
6. arc angle LK = angle LAK = 90°.
7. arc angle JK = angle JAK = 48°.
8. arc angle LMG = angle LAG = 180 - HAG =
= 180 - 30 = 150°.
9. arc angle JH = angle JAH = 42°.
10. arc angle KLM = angle KAM = 132°.
Find the simplified product where x20: √5x (√8x²-2√x)
√10x
2x √40x-2x
O 2x10x-2√5x
O2x10x-2x√√5
DONE
Answers
The solution of the expression is 2√5x(√2-1).
From the question, we have
√5x ( √8x² - 2√x)
= √5x ( 2√2x - 2√x)
= √5x(√2-1)(2√x)
= 2√5x(√2-1).
The solution of the expression is 2√5x(√2-1).
Multiplication:
Mathematicians use multiplication to calculate the product of two or more numbers. It is a fundamental operation in mathematics that is frequently utilized in everyday life. When we need to combine groups of similar sizes, we utilize multiplication. The fundamental concept of repeatedly adding the same number is represented by the process of multiplication. The results of multiplying two or more numbers are known as the product of those numbers, and the factors that are multiplied are referred to as the factors. Repeated addition of the same number is made easier by multiplying the numbers.
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Answer: ITS D
Step-by-step explanation:
2x sqrt 10x - 2x sqrt 5
WILL GIVE BRAINLIEST!!!
Why does the square root of 9 equal both 3 and -3?
Answers
Answer:
See below
Step-by-step explanation:
3 * 3 = 9 obviously
a negative number times a negative number equals a positive number
so -3 * -3 = + 9
What is 17.01 x 0.12?
Answers
Answer: 0.8412
Step-by-step explanation:
I need help right away now ??!??!
Answers
The expected value is 11.134
The expected value can be calculated as:
EV = ∑xₙ*pₙ
Where xₙ is the n-th outcome. For the case of the spinner we have 2 possible outcomes:
x₁ = 9
x₂ = 4
And pₙ is the probability of the n-th event.
For the case of each spinner, the probability of each section will be equal to the quotient between the degrees of each arc, and the total number of degrees in a circle (360°).
First, we can see that for outcome = 9, the angle is a right angle, then it is equal to 30°, then the probability of this event will be:
p₁ = 30°/360° = 0.083
And the angle for the second arc must be such that:
30 + A = 360°
A = 360 - 30 = 330
Then the probability for the outcome = 4 is:
p₂ = (330°/360°) = 0.916
Now we can find the expected value as:
EV = (*9 x 0.083 + 4 x 0.916 ) = 11.134
Therefore, the expected value is 11.134
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A cars company sells require a down payment of $2000 and 48 monthly payments. The contract amount for any of the cars is at least $19,940. What is the amount of the monthly payment? (To the nearest whole dollar) as an inequality?
Answers
Answer:923.36
Step-by-step explanation:
Cassie volunteers at an animal shelter. She needs a totsl of 40 hours of volunteers time for a class. So far, she has volunteered for 18.5 hours. How many more hours does she need to volunteer.
Answers
Answer: 21.5 hrs
Step-by-step explanation:
40 - 18.5 = 21.5 hours left
Answer:
21.5
Step-by-step explanation:
hope it helps
Petra eats five and three-fifths pies in a pie-eating contest. Paulie eats three and fourteen-fifteenths pies in the contest. How many more pies did Petra eat?
two and five-tenths pies
two and ten-fifteenths pies
one and five-tenths pies
one and ten-fifteenths pies
Answers
Answer: 6 8/15
Step-by-step explanation:
pls send the correct answer and show work!
Answers
x=140°
Explanation:
A 5-sided shape has a sum of 540°.
120+118+73+89+x=540
400+x=540
x=140°
Answer: x = 140°
Step-by-step explanation:
The sum of all interior angles in a pentagon is 540°.
Since you have every other angle except for one, you can subtract them from the total:
540°-120°-118°-89°-73° = 140°
Therefore the x angle is equal to 140°.
4
The ratio of words
missed to correct B
on Marcy's spelling
test was 1:4. If she
got 4 words wrong,
how many were
correct?
A
6.RP.1: Ratio Concepts
C
D
4
8
16
20
Answers
Marcy got only 1 correct answer.
What is ratio?The relationship in quantity, amount, or size between two or more things in proportion.
Given that, the ratio of words corrects to wrong is 1:4
She got 4 wrong answers so, her correct answers count = 1
Hence, the Marcy answered only one correct answer.
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line has a slope of –1/9 and includes the points (10,6) and (s,7). What is the value of s?
Answers
Answer:
s=1
Step-by-step explanation:
Slope formula is
Δy/Δx
Substitute in:
7-6/s-10=-1/9
cross multiply
7-6=-1/9s+10(1/9)
7-6=-1/9s+10/9
1-10/9=-1/9s
-1/9=-1/9s
divide both sides by -1/9
thus:
1=s
s=1
(check by plugging back in)
7-6/1-10=-1/9
HELP I DONT KNOW HOW TO DO THIS
Answers
Answer:
Square root of 45
Step-by-step explanation:
Using pythagoras theorem:
6^2+3^2 = 36+9 = 45
which is [tex]\sqrt{45}[/tex]
A rental car company charge $37. 93 per day to rent a car and $0. 11 for every mile driven. Taylor want to rent a car, knowing that:
She plan to drive 50 mile. She ha at mot $300 to pend. Which inequality can be ued to determine
d
d, the maximum number of day Taylor can afford to rent for while taying within her budget?
Answers
The inequality that can be used to determine the maximum number of days, d, Taylor can afford to rent for while staying within her budget is $37. 93(d) + $0. 11(50) < $300 or d < 7.76.
Inequality is defined as the relationship between non-equal numbers or expressions separated by <, >, ≤, or ≥.
Let d be the maximum number of days Taylor can afford to rent for while staying within her budget.
If a rental car company charges $37. 93 per day to rent a car and $0. 11 for every mile driven, and Taylor plans to drive 50 miles, then it will cost her $37. 93(d) + $0. 11(50).
If she has $300 at most to spend, then the inequality should be d < 7.76
$37. 93(d) + $0. 11(50) < $300
37. 93d + 5.5 < 300
37. 93d < 294.5
d < 7.76
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I need help. 10 point for whoever can help.
Answers
Answer:
B=4
Hope that helps! :)
A triangle has vertices on a coordinate grid at A(-7, 5), B(8,5), and C(8,0).
What is the length, in units, of AB?a
Answers
the united company had 15 applications for funding this year. if 8 of these applications can be funded, how many different lists of successful applications are there
Answers
A company received 15 funding applications and want to select 8 of them to be funded. The number of different lists of successful applications is 6,435
Suppose we have n objects in total and we want to select r objects among total objects, the number of ways they can be selected is given by the combination formula:
ⁿCr = n! / [r! (n-r)!]
Data from the problem:
n = total applications = 15
r = number of selected applications = 8
Hence, the number of different lists of successful applications is:
¹⁵C₈ = 15! / [8! (15-8)!]
= 15! / [8! 7!]
= 6,435
Thus, the number of different lists can be selected is 6,435
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