Set 40 = 5x + 10
Subtract 10 on both sides, then divide 30 by 5
x = 6
Answer:
From -2<x<-1, the function F(X) is increasing. (B)
Really, it increases all from around -2.5<x<0.5
C is also the second answer, as it increases til around 2.5
It is decreasing from -4<x<-3. But increases right after. It then starts to slow down around x = 1 and go down again.
Which means (B) is your answer.
If you want to get fancy, its a polynomial and if you take the derivative for instantaneous rate, you will see f prime is increasing if you make an example function.
The answer is 15 oz
Hope I helped
X - the total number of fish in the tank
6/7 of the fish in the tank have red stripes. 18 of the fish have red stripes.

There are 21 fish in the tank.