A human body has about 6x10^2 times as many red blood cells

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.

Can someone show me step by step how to do this?