The value of y varies jointly with the values of x and z When x = 4 and z = 10, the value of y is 360. What is the value of y when x 5 and z = 12?
A. 540
B. 9
C. 153
D. 450

A

Step-by-step explanation:

Joint variation is given by:

Where k is some constant.

We are given that y = 360 when x = 4 and z = 10. Therefore:

Solving for k:

Therefore, our equation is:

Then when x = 5 and z = 12:

The answer is A.

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soo this can be solve by using the formula:

f = p( 1 + i)^ n

where f is the future profit

p is the initial profit

i is the percent increase

n is the number of years

a . f = 30000 ( 1.05)^n

b. f = 30000 ( 1.05)^15

f = $62,368