Answer:
9 inches of rainfall produces the maximum number of gnats.
Step-by-step explanation:
Given : 
To Find :How many inches of rainfall produces the maximum number of gnats?
Solution:

G(x) =The number of gnats in millions.
x denotes the length of rainfall
To Find the maximum length find the mid point of zeroes .Since parabolas are symmetrical, the x value of the max falls 1/2 way between the zeros.



So, x = 0 , x= 18
Now Formula of midpoint : 


Hence 9 inches of rainfall produces the maximum number of gnats.
BD=90 DF=110 meaning BF=200
200/5x
X=40
Answer:

Step-by-step explanation:
Before adding the fractions we require them to have a common denominator.
Multiply the numerator/ denominator of the first fraction by 4
Multiply the numerator/ denominator of the second fraction by 3
+ 
Now add the numerators leaving the denominator
= 
= 
Answer:
It might be B
Step-by-step explanation: