Which of the following equations in an exponential growth function?

Question

a.y=(1/2)x
b.y=(1/4)x
c.y=(1/2)2x
d.y=2x

Answer 1

For exponential growth, you need the x as an exponent.

From the way you have it written, none of them show x as an exponent. So, I'd say NONE.

Answer 2

If you meant this:

a.y=(1/2)^x
b.y=(1/4)^x
c.y=(1/2)^(2x)
d.y=2^x

then only d is exponential growth. You don't need a negative exponent to be decay, you can also have a base between 0 and 1, which the other 3 choices have, making them all decay. If this isn't what you meant, then fix your question and we can stop guessing and get it right :-)

Answer 3

i'm afraid you're all incorrect. A, B and D are linear applications. i'm assuming that for the time of C you recommend (a million/2)^(2x) and not what you wrote (in any different case C is likewise linear). If that's what you meant, than C is exponential, yet no longer advance. It truthfully decreases exponentially.

Answer 4

I'd say c since I think you meant the 2x to be an exponent. The rest are all linear.

Answer 5

if by "c" you mean

y = (1/2)^(2x)

then C. is the answer.

y = ax^r is exponential growth
y = ax^(-r) is exponential decay.

Answer 6

prety sure none of them are