Solve the system by substitution or elimination. {-x+y=22x+y=-1

87.12-83.42 what is the difference

How many pints of olive oil are needed to fill 1 quart

Elisas mom teaches at a preschool. there is 1 teacher for every 12 students at the preschool. there are 276 students at the preschool. elisa is setting up equivalent ratios to find the number of teachers at the preschool.

A Ferris wheel can accommodate 45 people in 25 minutes. How many people could ride the Ferris wheel in 3 hours? What was that rate per hour?

How to find perimeter of the base

Write word phrase to represent the numerical expression below. 4 + (27-10)

Find the value of y when x=2 - x - (-2) = y

In a group of 21 students, 8 students take Art courses, 7 students take Music courses. Two students take both courses. A student is chosen randomly from this group. What is the probability that the student takes either Art or Music courses? 57

5% of what number is 63?

Find the sum of the "n" terms of the series: Sn=1²+3²+5² + ... + (2n-1) ²