Why do fractions need a common denominator when you add or subtract them?

How to graph the solution of each linear inequality

4. If your car is going 50 miles in 2 hours, what is its average speed?

Rosa's best time in a race is two seconds faster than her second-best time. Her second-best time is 1 1/4 times her best time. What is her best time? A) 12 seconds B) 10 seconds C) 16 seconds D) 8 seconds

Determine wether the graphs of y=3x+5 and - y=-3x-13 are parallel, perpendicular, coincident, or none of these

The sum of s students and 9 students

The sum of two numbers is 50 the first number is 43 less than twice the second number write and solve a system of equations to find the two numbers

A parallelogram has a base of 45 meters and a height of 11 meters what is the area of the parallelogram?

According to a magazine, a cleaning solution of 5% bleach will remove mildew from a shower or tub. a. How many ounces of bleach do you need to make a quart of 5% bleach solution? b. Explain the method you used using complete sentences.

What is doubles fact 7+8

Julie is going to a store to buy vases to use as centerpieces at her party. Small vases cost $2 and large vases cost $4. She needs to buy a minimum of 15 vases, and can spend a maximum of $50.