Why do you add a zero when multiplying two digit by two digit numbers?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

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.

Have yall ever just farted and was like, i farted.