A = 2(L+W) solve for W

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)