Writing the equation of a quadratic function given its graph i just need to know the formula to get the equation

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?

Which of the binomials below is a factor of this trinominal? x^2-13+30

At which value in the domain does f(x) =0?