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grandymaker [24]
2 years ago
8

What is 15x-4+20 into a decimal

Mathematics
1 answer:
andriy [413]2 years ago
6 0

Answer:

1.6

Step-by-step explanation:

it's really 15x-4+20=0

So carry the 20 and you get 15x-4=20

add the 4 and you get 15x=24

So 24 divided by 15 is 1.6

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What's two thirds of a straight line?
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6 0
3 years ago
Jane opened a savings account with 700 and was paid simple interest at an annual rate of 2% . When Jane closed the account, she
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5 years

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3 0
3 years ago
According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the populati
Ghella [55]

Answer:

Step-by-step explanation:

Hello!

The variable of interest is:

X: number of daily text messages a high school girl sends.

This variable has a population standard deviation of 20 text messages.

A sample of 50 high school girls is taken.

The is no information about the variable distribution, but since the sample is large enough, n ≥ 30, you can apply the Central Limit Theorem and approximate the distribution of the sample mean to normal:

X[bar]≈N(μ;δ²/n)

This way you can use an approximation of the standard normal to calculate the asked probabilities of the sample mean of daily text messages of high school girls:

Z=(X[bar]-μ)/(δ/√n)≈ N(0;1)

a.

P(X[bar]<95) = P(Z<(95-100)/(20/√50))= P(Z<-1.77)= 0.03836

b.

P(95≤X[bar]≤105)= P(X[bar]≤105)-P(X[bar]≤95)

P(Z≤(105-100)/(20/√50))-P(Z≤(95-100)/(20/√50))= P(Z≤1.77)-P(Z≤-1.77)= 0.96164-0.03836= 0.92328

I hope you have a SUPER day!

3 0
2 years ago
When water is released from the Kinzua Dam it is released gradually. The water level in Kinzua reservoir changes at an average r
Oliga [24]

Answer:

Option D

- 1916 inches

Step-by-step explanation:

To easily solve this problem, we apply a rule of three

-916 inch ---------------------------------- 3 hours

x inch ---------------------------------- 8 hour

x = 916 inc * (8 hours / 3 hours)

x =  2442.66 inch

The nearest number for this value is option D

(Lets remember we are talking about average values)

3 0
3 years ago
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