Question

WILL MEDAL
Question 10 (Multiple Choice Worth 1 points)

(04.05)

The graphs below show four functions:

Graph A shows function f of x equals 4 multiplied by 3 to the power of x. Graph B shows function f of x equals 4 multiplied by 3 to the power of negative x. Graph C shows function f of x equals 10 to the power of x. Graph D shows function f of x equals 10 to the power of negative x.

Which graph best shows the function f(x) = 4(3)−x to represent the rate at which a radioactive substance decays?

Graph A
Graph B
Graph C
Graph D

Answer 1

Is that 4(3)^-x?

Answer 2

No it's just 4(3)-x

Answer 3

Just translate them into equations.

Answer 4

So would the ANWSER be b???

Answer 5

Correct.

Answer 6

None of the others have a negative x. And I do believe that it is 3 to the power of -x as in 3^-x.

Answer 7

So it is b ????

Answer 8

Yes. The question asks for radioactive decay. Since x is positive in graph A, it cannot be the answer. Since x is negative in graph B, it is correct.

Answer 9

@Mrs.ambrose614