For 28(3/4), the answer is 21
the recipocal is 0.17857142857
OK...
If you know the volume of P and t and i.
Then Use this: r=P÷i÷t
I think you mean that, right?
Answer:
The slope is 0.
Step-by-step explanation:
slope formula: 
Given points: (-1, 2), (3, 2)
(-1, 2) = (x1, y1)
(3, 2) = (x2, y2)
To find the slope, input the given points into the formula used to find slope:

Simplify:
2 - 2 = 0
3 - (-1) = 3 + 1 = 4

The slope is 0.
Hope this helps :)