Question

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

Answer 1

@campbell_st @CBARREDO1

Answer 2

B and C don't decay, they increase
A and D decay but only A has (0,5) on the graph

Answer 3

do some basics

let x = 0

what is the value of

\[f(0) = 5 \times 2^0\]

that gives the y-intercept

and then since the power is negative... as x gets larger f(x) gets smaller

Answer 4

A is the answer right i just wanted to make sure

Answer 5

@CBARREDO1

Answer 6

What?

Answer 7

iS A RIGHT

Answer 8

A is correct, when x = 0 f(x) = 5

and the cruve is decreasing as x gets larger

Answer 9

As I said the correct answer is A