Question

I need help on a and b

Answer 1

Problem A

A rectangle has equal diagonals

So 9x + 20 = 10x + 8 Subtract 8 from both sides.

9x + 20 - 8 = 10x

9x + 12 = 10x Subtract 9x from both sides.

12 = 10x - 9x

12 = x Answer <<<<<

Problem B

The diagonals of a rhombus bisect the angle vertex that the diagonal is connect between. All that language says is that

2x + 15 = 5x + 3 Subtract 2x from both sides.

15 = 5x - 2x + 3

15 = 3x + 3 Subtract 3 from both sides.

15 - 3 = 3x

12 = 3x Divide by 3

12/3 = x

x = 4 <<<< Answer B

When x = 4 the two angles are equal.