Question

Which of the following is NOT an exponential decay function?

A: y = (3/4)^x
B: y = 5.6^x
C: y = 14(0.62)^x
D: y = (1/6)^x

Answer 1

`\boxed{\sf B: \: y = 5.6^x }`

Explanation:

An exponential decay is when we input the input value and the output value decreases or in simple words, as the value of x increases, the value of y decreases.

We can see option B.

`\sf y = 5.6^x`

When we increase the value of x, the value of y will no doubt increase. So the function is not an exponential decay function.

Answer 2

B

Explanation:

An exponential decay function can be written in the form;

V = I(1-r)^t

A can be written as

y = 0.75^x

y = (1-0.25)^x

B cannot be written as that

c as y = 14(1-0.38)^x

d as y = (1-0.83)^x