Which 3 numbers have the same answer whether they are added or multiplied

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.

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)