Cathy paid a $30 sign-up fee for a new streaming service. She got a 5% discount on her monthly bill. After 6 months, she has paid a total of
$142.52. How much is the monthly fee before the discount?

Asphere has a diameter of 10 in. what is the volume of the sphere?

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.

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?