Use the linear combination method to solve this system of equations. what is the value of 3x+7y=3 x-7y=1

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.

Sioux co. replaced the roof on its existing building, therefore increasing the building's life by 10 years. the cost of the roof is considered a(n):

Which of the following is another way to express the difference between -5 and 8?