Harper takes a piece of plywood that is 16 inches long and uses a table saw to make a 20-inch cut from the corner to the opposite corner. What was the width of the piece of plywood?

Find the area of an equilateral triangle with a side of 6 inches

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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.