Answer:
1.6/-8
Step-by-step explanation:
Rate of change is slope. So you need to use the slope formula: m=(y2-y1)/(x2-x1). You can decide which pairs will be 1 and 2 and will get the same answer, but keep the pairs together. So, if you do (3.6-2)/(-3-5) you will get 1.6/-8. If you needed to simplify to a fraction without a decimal you could do 1.6/-8 = .8/-4 = 8/10 x 1/-4 = -1/5.
4 is the slope because the formula for slope is (y2-y1) / (x2-x1) or (8-0) / (3-1) which simplifies to 8/2 = 4
Increase because the amount of batteries is the same!