Why is a question mark used above the equal sign when checking whether or not a given value is a solution to an equation?

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

About 9% of th population is hopelessly romantic. if 2 people are randomly selected from the population, what is the probability that at least 1 person is hopelessly romantic?