I need help... please help me through this trigonometry. I need full answer.

The gades foundation and hbm corporation are eager to donate generously to their favorite charities. the gades foundation donated $250 in the first month, and each month afterward their cumulative donation total increases by 100$ the hbm corporation donated $64, in the first month, and each month afterward their cumulative donation total increases by 75%. in which month will the hbm corporation's cumulative donation total first exceed the gades foundations' cumulative donation total?

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

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.