Time (hours) Number of bacteria
0 1000
3.4 1340
8.5 2105
11.9 3380
13.6 3992
(a) Find the average rate of change for the number of bacteria from 0 hours to 8.5 hours.

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.

answer is 33

step-by-step explanation: