Question

Will give medal.

The graphs below show four functions:


Which graph best shows the function f(x) = 5(2)-x to represent the rate at which a radioactive substance decays?

Answer 1

Graph A
Graph B
Graph C
Graph D

I think it's A, but I'm not sure.

Answer 2

@im.celibate

Answer 3

first f ind the x and y intercepts

Answer 4

Some of the x intercepts aren't visible.

Answer 5

x-intercept set y to 0, y intercept set x to 0
f(x) = 5(2)-x
y intercept: \(5(2)^{-0}=5*1=5\)

Answer 6

so would it be B?

Answer 7

we've got it narrowed down to either A or B because those are the ones that hit the y axis at 5

Answer 8

but because the number in the parentheses is a whole number it would be B, right?

Answer 9

it'd be A

Answer 10

oh ok, thanks!

Answer 11

the x is negative