Which ratios form a proportion?

A. 20/25, 14/21

B. 10/23, 18/7

C. 5/45, 4/36

D. 5/4, 4/5

Jack rode his bike to school at 12 mph and then jogged back at 6 mph. If the round-trip took him six hours, how far was it to school?

The markup over dealer's cost of a new car ranges from 11% to 21%. If the sticker price is $16,000, over what range will the dealer's cost vary?

The sum of 2 interior angles of a triangle is 140°. What is the measure of the third interior angle? A. 220° B. 40° C. 30° or D. 50°?

Work out the area of this circle with a radius of 6mm. Give your answer in terms of pi

It was 6 feet long! When the sandwich arrived, Zachary cut it into 16 equal pieces. How long was each piece?

Explain in words how to change a fraction to a percent

There are 3 strawberry ice creams, 4 chocolate ice creams, and 7 vanilla ice creams on a tray. barbara selects 2 ice creams at random without replacement. what is the probability that she selects 2 chocolate ice creams?

Sandy works at a store that sells clothing accessories. The supply function for scarves is P = Q-9, where Pis the price and Q is the quantity of scarves. If Sandy sells the scarves for $12 apiece, how many scarves will the store supply?

Store A: $25 for a 45 minute lesson Store B: $30 for a 1 hour lesson Store C: $45 for a 1.5 hour lesson Store D: $80 for three 1 hour lessons Julie wants to purchase swim lessons for her son. There are four different stores that offer swim lessons.

What percent of 123 is 140