Solve the system of equations by substitution.

x+y=18

y=8x

How many rectangular prisms can be made with 18 unit cubes?

How do you write (3/4) as a fraction

Tomas works as an underwater photographer. He starts at a position that is 13 feet below sea level. He rises 6 feet, then descends 15 feet to take a photo of a coral reef.

Estimate the sum or the product. 1. 1.52 (98) 2. 2.04 (3.97) 3. 4.42+5.91

Evaluate n2+5 when n=3.

In 2 hours a candymaker can produce 80 boxes that each contain 10 pieces of candy. How many pieces of candy does the candymaker produce in 6 hours?

What is the answer to 3 3/8 - 1 5/6=

Solve for x. 6 (x+1) - 2x-1 = (x+15) + (x+16) ?

3*3 - 3 - 3:3 - 3 - =

A bicyclist travels at a rate of 13 miles an hour. If the bicyclist continues at this rate, how many miles can the bicyclist travel in 0.5 hour?