The answer is C and D
First we must make one side of the equation zero, so we subtract 7 on both sides of the equation, making the equation 9x^2 - 6x - 6 = 0
Then we will use the quadratic formula to find the answers.
using the Quadratic Formula where:
a = 9, b = -6, and c = -6
and the formula is 6 +- 
It’s not going to be C because 10 is already in the question
Answer:
2
Step-by-step explanation:
F(180) = x/30
= 180/30 = 6 gallons of gas is needed