Answer:
35+4x+5+6x=180
10x=180-40
x=140/10
x=14
A computer’s random number generator produces random integers from 1 to 50. What is the probability that at least one of the first 4 generated numbers is in the 20s?
0.0016
0.1024
0.4096
0.5904
Answer:
0.5904
Step-by-step explanation:
For each number, there are only two possible outcomes. Either it is in the 20s, or it is not. The probability of a number being in the 20s is independent of other numbers. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
In which [tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by the following formula.
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
And p is the probability of X happening.
4 generated numbers:
This means that [tex]n = 4[/tex]
Probability of a number in the 20s:
From 1 to 50, there are 50 numbers. Of those(from 20 to 29), there are 10 in the 20s. So [tex]p = \frac{10}{50} = 0.2[/tex]
What is the probability that at least one of the first 4 generated numbers is in the 20s?
Either none is, or at least one is. The sum of the probabilities of these events is 1. So
[tex]P(X = 0) + P(X \geq 1) = 1[/tex]
We want [tex]P(X \geq 1)[/tex]. So
[tex]P(X \geq 1) = 1 - P(X = 0)[/tex]
In which
[tex]P(X = 0) = C_{4,0}.(0.2)^{0}.(0.8)^{4} = 0.4096[/tex]
[tex]P(X \geq 1) = 1 - P(X = 0) = 1 - 0.4096 = 0.5904[/tex]
Can someone please answer this question? I really need the answer please. Q:Two signs are on a street. One blinks every 10 s and the other every 6 s. How many times per minute do they blink together?
15 inches² =blank amount of feet ²
Answer:
351.5625 ft squared
Step-by-step explanation:
First multiply 15 times 15 and get 225, then divide this by 12 and you will get 18.75 now muliply it by 18.75 and you will get 351.5625.
Alright Hope It Helps This Time.
decompose x^2+4x-3/x-2
Answer:
[tex]\dfrac{x^3-2x^2+4x-3}{x-2}[/tex]
Step-by-step explanation:
The given equation is :
[tex]x^2+\dfrac{4x-3}{x-2}[/tex]
We need to decompose this equation.
We have,
[tex]x^2+\dfrac{4x-3}{x-2}\\\\=\dfrac{x^2(x-2)+4x-3}{x-2}\\\\=\dfrac{x^3-2x^2+4x-3}{x-2}[/tex]
So, [tex]\dfrac{x^3-2x^2+4x-3}{x-2}[/tex] is the decomposed form of the given expression.
how do you do #9???? help
Step-by-step explanation:
So we just need to complete the table
So we need the next three x digits which is
[tex]\frac{8}{5}, \frac{12}{5}, \frac{16}{5}[/tex]
Next y digits would be
[tex]\frac{2}{2}, \frac{3}{2}, \frac{4}{2}[/tex]
Hope This Helped!!
(Just fill out the x rows with the next x digits and the y rows with the next y digits)
A principal of $2700 is invested at 8% interest, compounded annually. How much will the investment be worth after 15 years?
Use the calculator provided and round your answer to the nearest dollar.
Answer:
$8564.86 to nearest cent.
Step-by-step explanation:
Investment after 15 years = 2700(1 + 0.08)^15
= 8564.856608.
A type of battery-operated led lights has a known mean lifetime 7.9 hours with standard deviation 0.5. Assuming that the lifetimes of these led lights have a nearly symmetric/bell-curve distribution, find the percent (%) of these led lights having lifetime between 7.9 and 8.9 hours.
Answer:
47.5% of these led lights have lifetime between 7.9 and 8.9 hours.
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 7.9 hours
Standard deviation = 0.5 hours
The normal distribution is symmetric, which means that 50% of the measures are below the mean and 50% are above.
Lifetime between 7.9 and 8.9 hours:
7.9 hours is the mean.
8.9 = 7.9 + 2*0.5
So 8.9 hours is two standard deviations above the mean.
Of the 50% of the measures that are above the mean, 95% are between the mean of 7.9 and two standard deviations above the mean(8.9). So
0.5*0.95 = 0.475
47.5% of these led lights have lifetime between 7.9 and 8.9 hours.
Aralynn is making a quilt. She has used 5.5 balls of yarn and will need 8
more. How many balls of yarn will she have used when she's finished?
Answer:
13.5
Step-by-step explanation:
5.5+8=13.5
An Air Conditioner uses 850 Watts of electricity and local emissions from electricity produce 1.37 pounds of CO2 per kWh. If you open a window instead of using the AC for 6 hours, how many pounds of CO2 would you keep from entering the atmosphere?
Answer: 6,987,000 pounds fo CO₂ per kWh.
Step-by-step explanation: Quilowatt-hour (kWh) is a unit of energy that measures the amount of energy expended in 1 hour.
The AC uses 850 Watts, which in kW is 850,000 kW
If you leave the AC on for 6 hours, it will consume
850,000(6) = 5,100,000 kWh
Eletricity produces 1.37 pounds of CO₂ per kWh, then in 5,100,000 kWh:
1.37 [tex]\frac{pounds}{kWh}[/tex].(5,100,000kWh) = 6,987,000 pounds
If you open a window for 6 hours, you would keep 6,987,000 pounds of CO₂ for entering the atmosphere.
Given the points (1,6) and (8, -3), find the horizontal distance between the points
Answer:
7
Step-by-step explanation:
8 - 1 = 7
thank, 5 star, brainliest if helpful!
I need help with this question ASAP.
Answer:
A, 6x
Step-by-step explanation:
The graph is positive and is increasing at such a rate 1/6x doesn't work
Which expression has a value greater than 4^3?
Answer:
(-3)^4
Step-by-step explanation: We just have to evaluate
So, the only expression that exceeds 4^3 is (-3)^4:
Tomiko will also make pumpkin cheesecake.
She has this list of ingredients to make the cheesecake.
Pumpkin cheesecake
serves 11 people
200g ginger biscuits
100 g butter
500g double cream
600g soft cheese
75g sugar
300g pumpkin puree
Tomiko has 360g of soft cheese.
She has plenty of the other ingredients.
Tomiko wants to make enough cheesecake for 8 people.
(b) Does Tomiko have enough soft cheese to make cheesecake for 8 people?
Select the correct answer. Consider functions f and g.
whats is 4 + 2y = 3x?
Answer:
y = - 3/2x - 2
Step-by-step explanation:
that would be the correct answer happy 2 help
I heard that you might have to increase your prices by 12%. If I normally pay $45 per order, how much would my order be if the price increase happens?
Answer:
If the price increase happens, your order would be $50.4.
Step-by-step explanation:
To be able to determine how much would the order be if the price increase happens, first you have to calculate 12% of the normal price per order:
$45*12%=$5.4
Then, you have to add $5.4 that is the amount of the increase plus the normal price per order:
$5.4+$45=$50.4
According to this, the answer is that if the price increase happens, your order would be $50.4.
I GIVEEE BRAINLILSTT
Answer:
Step-by-step explanation:
If a point is dilated by a scale factor 'k' centered at the origin,
Coordinates of the image point becomes as,
(x, y) → (kx, ky)
By this rule,
Coordinates of the vertices of the image triangle, when preimage is scaled by a factor of 5 about the origin will be,
T(-1, -2) → T'(-5, -10)
U(2, -2) → U'(10, -10)
V(-1, 1) → V'(-5, 5)
Answer:
vsdfvbfbxfvfbfsdcvdsvdv
Step-by-step explanation:vdsv
bfbfxdbvcbcvbdfbvdsvdsvdsvds
what is 23d=109
Please answer
Answer:
d=4.73913043 or d=4.74 rounded
Step-by-step explanation:
John rode his bicycle to school and back home. The distance from his home to school is 1.30 miles. What is the approximate number of kilometers that John rode? (1.00 kilometers = 0.62 miles)
Answer:
4.1935483871km
Step-by-step explanation:
Distance to and back = 1.3 miles *2 = 2.6miles
To convert kilometres to miles, multiply by 0.62. Therefore, to convert from miles to kilometres, divide by 0.62.
2.6/0.62=4.1935483871km
Alice is saving money at a constant rate. Suppose she initially has $70 saved, and after 2 months, she has $170 saved.
Which of these expresses the rate at which Alice is saving?
Select the correct answer below:
50 dollars per month
70 months per dollar
−50 dollars per month
50 months per dollar
100 dollars per month
Answer:
50 dollars per month
Step-by-step explanation:
Given
[tex]Months = 2[/tex]
[tex]Total = 170[/tex]
[tex]Initial = 70[/tex]
Required
Determine the rate of savings
Suppose in a month, she saves x amount.
In 2 months, she would save 2x
When 2x is added to the initial savings, it gives the total amount saved.
So, we have:
[tex]2x + 70 = 170[/tex]
Collect Like Terms
[tex]2x = 170 - 70[/tex]
[tex]2x = 100[/tex]
Divide both sides by 2
[tex]x = \frac{100}{2}[/tex]
[tex]x = 50[/tex]
Hence, she saves $50 dollars monthly
A TV has a listed price of $800 before tax. If the sales tax rate is 8%, find the total cost of the TV with sales tax included. Round your answer to the nearest cent, as necessary. Show your work.
Answer:
The total cost of the TV with sales tax included is $864.
Step-by-step explanation:
In order to find the the total cost of the TV with sales tax included, you have to calculate the 8% of the listed price and add this amount to the price:
$800*8%=$64
$800+$64=$864
According to this, the answer is that the total cost of the TV with sales tax included is $864.
Simplify the expression
Answer:
46-55i
Step-by-step explanation:
The Graisers invested $500 at 6.5% compounded continuously. Find the value of the investment after 7 years? When will the investment triple in value?
Answer:
$788.05 is the value after 7 years. it would take 17 years to triple in value.
WILL MARK BRAINLIEST Determine if each of the following are direct (D), Inverse (I), or neither (N). On the first blank, write the letter that corresponds with the variations. In the second blank, write the constant of variations. If the function doesn't have a constant of variations than leave the second blank empty. (PLEASE REFER TO PICTURE)
Answer:
A is neither, B is direct, and C is inverse
Step-by-step explanation
In B, as x increases y also increases, in C as x increases y decreases, and in A it's neither because it's not one line (if you graphed it you would understand what I mean). Though I have no idea what is constant of variations.
Which symbol makes the statement true? 4/8 _____ 2/10
Answer:
4/8 is greater than 2/10
Step-by-step explanation:
4/8=.50
2/10=.20
Answer:
4/8 > 2/10
Step-by-step explanation:
because 4/8 also equals 1/2 and 2/10 equals 1/5 so 4/8 is bigger than 2/10
A glass is
1
-
4
full. Then 24cm3 of orange juice is poured in.
The glass is now
2
-
5
full.
What is the total volume of the glass?
Answer:
2/5 - 1/4 = 8/20 - 5/20 = 3/20
(3/20)t = 24
t = 160
160 cm3
Step-by-step explanation:
Answer:
2/5-1/4=8/20-5/20=3/20
Step-by-step explanation:
3/20/t=24
t=160
A scientist is at spot that has Ang angle elevation of25.4' top 223 foot all observation
Complete question
A scientist is at spot that has An angle elevation of 25.4' top 223 foot all observation. How far is the scientist from the base of the observatory
Answer:
[tex]X\approx469.64[/tex]
Step-by-step explanation:
From the question we are told that
Angle of elevation [tex]\theta= 25.4'[/tex]
Height [tex]H=223[/tex]
Generally the equation for the Distance X is mathematically represented as
[tex]X=\frac{H}{tan\theta}[/tex]
[tex]X=\frac{223}{tan 25.4\textdegree}[/tex]
[tex]X=469.6369092[/tex]
[tex]X\approx469.64[/tex]
Therefore the distance is
[tex]X\approx469.64[/tex]
what type of math is this
Answer: You didn’t add an image?
Step-by-step explanation: What do you mean??
What is the area of the red? Use 3.14 for π.
Find the sum. one ninth + one twelfth A. 7 over 36 B. six sevenths C. one over thirty-six D. 1 over 7h
plz help fast i am stuck. and thank you
12/14/2020
Answer:
A. 7 over 36
Step-by-step explanation:
One ninth =1/9
One twelfth = 1/12
1/9+ 1/12= 12+9/108
= 21/108
We can then reduce the fraction to the lowest denominator by dividing the numerator and denominator by 3
That will result in 7/36