Dexter paid $74.94 for 201⁄5 gallons of gas. what is the price of gas where dexter filled up his vehicle?

a. $3.73/gallon
b. $3.72/gallon
c. $3.71/gallon
d. $3.68/gallon

C. $3.71/gallon

Step-by-step explanation:

Take $74.94 divided by 20 1/5 (or 20.2), this equals the unrounded decimal 3.70990099.

Rounded to 2 decimal places, this equals 3.71

Therefore, C. $3.71/gallon is correct.

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)