At scott's laundromat, the washing machines accept only quarters and nickels. if joe used 20 coins worth $2.60 to wash 4 loads, how many of each coin did he use

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x