I don't know how to do it can someone explain to me?

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11