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

Question

anonymous · Answer

this is the equation of a line
f(x)=9-x
y=9-x
You could find the graphic giving some valors. For example:
For x=0 which is the valor of y? 
y=9-0=9
so , now you have one point of your line (0,9)
For y=0
0=9-x
x=9
Other point (9,0)
|dw:1436124784805:dw|

anonymous · Answer

you guys have got to draw out your equations, or use the ^ symbol for exponents and use parentheses.

anonymous · Answer

Pretty sure that's supposed to be an exponential function not linear

anonymous · Answer

lol