Evaluate the given expression 10 c4•10c2

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Arectangular garden measures 5m by 7m. both dimensions are to be extended by the same amount so that the area of the garden is doubled. by how much should the dimensions increase, to the nearest tenth of a metre?

Which values of m and b will create a system of equations with no solution? y=mx+b y=-2x+3/2