Why did most ancient cultures primarily write out their mathematical texts in words?

Simply 8x squared + 5(7x squared- x) - 2x =

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

X2 + y 2 = 36 x + y = 6 solve the system of equations.