How do I factor an expression using the GCF?

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?

In trapezoid efgh, m∠gfe=63∘. identify m∠ghe. !

I'm confused on this could anyone me and show me what i need to do to solve it.