The sum of the angle measures in a 21-gon is

Chad is driving 56 miles per hour. Chad drove 168 miles in 3 hours. Chad will drive 672 more miles. He continues to drive at the same rate. How many hours will it take Chad to drive 672 miles?

Three numbers are in arithmetic progression. Their sum is 3 and the sum of their squares is 11. What are the three numbers?

How do u divide 390 and 345

What is the answer to 7/12 plus 1/2

17/4 as a decimal explained

William earns $15 each time (t) he mows a lawn. Which equation can be used to determine how many lawns William mowed if he earned $75?

Solve for x: 9^ (x-8) = 3^ (4x-12)

Trey is estimating the length of a room in his house. The actual length of the room is 17 m. Trey's estimate is 15 m. Find the absolute error and the percent error of Trey's estimate. If necessary, round your answers to the nearest tenth.

Which ordered pair is a solution of the equation y = 4x? (1, 3) (-1, - 4) (-4, - 1) (1, - 4)

A bowl contains 3 red, 8 blue, and 7 black beads. Margaret randomly selects 3 beads one after the other without replacement. Find the probability of getting a red, blue, and black bead, in that order.