A biologist studying bacteria finds that when the bacteria are exposed to ultraviolet light, the population can be modeled by an exponential decay function with 9% as the
rate of decrease.
Which could be the function that models the bacteria population?

-A: y=9(0.09)^x
-B: y=48(1.9)^x
-C: y=255(1.09)^x
-D: y=360(0.91)^x

only 10/60 isn't equivalent

hope this : )

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.