Cos theta=+- square root 1-sin^2theta

Find the values of the variables in the kite

If i purchase a product for $79.99 and two accessories for 9.99 and 7.00 how much will i owe after taxes applies 8.75%

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)