Simplify.

Rewrite the expression in the form a^n

a^-13/a^-6 = ??

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Rewrite the following quadratic functions in intercept or factored form. show your work. f(t) = 20t^2 + 14t - 12