He would spend $65.80 on 20 gallons of gas.
If each of the 28 students made at least $25, you would multiply 28 and 25 together to obtain the least amount of money the class raised. That gets, 28x25 = 700. The class made at least $700.
M is the slope.
B is the y-intercept
The constant of proportionality is the ratio between two directly proportional quantities.
The answer is B . your welcome