Please please please help can you explain the answers for all of them and if you can’t can you just do a little bit

The multiplicative property of equality states that for real numbers a, b, c, and d, if a = b and c = d, then ac = bd. true false

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

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =