Let just keep a conversation going about anything (im b. ore)

Can someone check if i did this correct. it’s number 4 if you’re wondering.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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.