Solve for x 0.4(5+2x) -0.5=3(0.3x + 0.7)

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Evaluate cos2θ for cosθ = square root of 3/2

1. are the corresponding angles congruent 2. find the ratios of the corresponding sides 3. is triangle jkl congruent to triangle rst? if so what is the scale factor