37. B: Negative inverse, the product of the gradients is -1
38. C: decreases
39. B: the sum of all divided by 9
The answer is D because my dad said so and my dad knows everything
They are 20% off so the cost 80% percent of what the originally cost (1.00 - .20 = .80)
<span>So multiply .8 by 75
</span><span>new price = 75*(.8) </span>
<span>new price = 60 </span>
