Teresa's company makes solid metal balls for various industrial uses. A customer wants lead balls that have a diameter of 6 in. If Teresa must make 80 of these balls, how much lead will she need?
Use 3.14 for it, and do not round your answer.

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.

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

Can anyone explain to me how to do this? anything will .