f(x) = 2*(1/8)^x

**and**h(x) = -7*(1.567)^x-5

I heard that the first digit is the starting amount, such as 2 in f(x) and -7 in h(x).

This is proven wrong when I input h(0) into the second function. The reason I input 0 is because it is logically the starting amount of x, but this assumption immediately contradicts h(x)'s starting amount of "-7" if solved for x=0. The answer?

**-0.74.**

Which claim should I follow? The "first-digit-is-the-starting-amount," claim or my "zero-is-the-logical-start-point," claim?