four red boxes and two black boxes cost $40. Five red boxes cost $20. All red boxes cost the same. All black boxes cost the same. What is the ratio of the cost of a red box to the cost of a black box.

a load of bricks is twice as heavy as a load of sticks the total weight of 1 load of bricks and 3 loads of sticks

Find the missing value 18% of is 99

Find the unit rate a) 180 miles in 3 hours (how many miles in 1 hour) b) 256 miles per 8 gallons (how many miles per gallon) c) $9.60 for 4 pounds (how much per pound) d) $4.80 for 6 cans (how much per can) e) 297 words in 5.

Parallel line to 2x+3y=6 passing through (6,-3)

It takes Jim 25 minute's to ride his bike 8 miles. how far can he ride in 90 minutes? round to the nearest tenth

What is the slope of the line shown below (-4,3) (3,1) a. 7/2 b,. 2/7 c. - 7/2 d.-2/7

A digital scale reports a 10 kg weight as weighing 9.998 kg. which of the following is true?

Starting time 2:15 A. M. elapsed time 45 minutes

64p=-16+8p-40p^2 solve by factoring.

Set V is all the unique three-digit numbers using the digits 1, 2, 3, 4, and 5. Which set would be considered a subset of set V? Set W is all the unique three-digit numbers using the digits 1, 3, and 5.