I can drive my truck 27 miles on 2 gallons of gas. What is the unit rate in miles/gallons?

13.5 miles per gallon

Step-by-step explanation:

Take the total number of miles and divide by the number of gallons

27 miles/2gallons = 13.5 miles per gallon

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

correct answer:

a + bi