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3 years ago

What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

1 answer:

7 0

You would substitute 0.8 in for y and to get the equation 4x+8(0.8)=40. Then, you would simplify and get 4x+6.4=40. Next you would isolate x by subtracting 6.4 from both sides and get the equation 4x=33.6 and then you would divide both sides by 4 to get x=8.4.

The answer is : x=8.4

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You wish to find a 95% confidence interval for the mean number of times men change channels with a remote control during a comme

gogolik [260]

For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.

4 0

3 years ago

14-5+20÷2^2+4 wich order

Sladkaya [172]

14-5+20÷2∧2+4

exponent first: 14-5+20÷4+4

Divide: 14-5+5+4

Solve left to right: 9+5+4

add all: 14+4 = 18

8 0

3 years ago

Please help!!!!!!!!!!

steposvetlana [31]

9514 1404 393

Answer:

-203.1875

Step-by-step explanation:

The ends of the interval are ...

(-4, g(-4)) = (-4, 1023 15/16)

(1, g(1)) = (1, 8)

The average rate of change is the slope of the line between these two points:

m = (y2 -y1)/(x2 -x1)

m = (8 -(1023 15/16))/(1 -(-4)) = (-1015 15/16)/5 = -203 3/16

The average rate of change on the interval is -203 3/16.

5 0

3 years ago

Options A)117 B)39 C)3 D)63

hichkok12 [17]

Answer:

B. 39

Step-by-step explanation:

3x=117divided by 3=39

4 0

3 years ago

1) Original price of a goldfish: $7.70 Discount: 30%

Leni [432]

Answer:

$5.39

Step-by-step explanation:

In order to solve for this equation, we are going to multiply 7.70 by 0.3 to find how much money was taken which was 2.31.

Subtract2.31 from 7.70 to recieve your new price :)

$7.70*0.3=2.31\\7.70-2.31=5.39$

Hope this Helps!

8 0

3 years ago