If the area of ABCD is 90 square units, what is its perimeter? Round to the nearest tenth if needed.

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.