How would you describe the relationship of these two variables and what does it mean?

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

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.

If there are 3.281 feet in 1 meter, how many inches are in one centimeter