Question

The graphs below show four functions:

Answer 1

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 2

can u help me?

Answer 3

lol u found it without me tagging u

Answer 4

I saw you bump it to the top lol and I saw you typing so I just put 2 together lol

Answer 5

when x = 0, what y?

Answer 6

what *is* y ?

Answer 7

f(x) is basically y

Answer 8

right

Answer 9

so what is f(0) ?

Answer 10

so im thinking D because it says decay which means die and I don't know bout yall but when something dying it aint going up and then from what ^ he said d is the only one touching the 0 line so im say D

Answer 11

am I right @niko ?

Answer 12

no

Answer 13

tthen what is it?

Answer 14

it's B

Answer 15

can you explain why?

Answer 16

for B, f(0) = 4 (-3)^0 = 4

for D, f(0) = 1.

That's why I asked what f(0) is in the beginning, because once you know what f(0) is, you would already eliminate C and D. And since it is a decay exponential function, we know it's B.

Answer 17

ok thanks guys