The slope between each pair of points

4/7

Step-by-step explanation:

To find the slope, we have our equation (y2-y1)/(x2-x1). If we plug in the coordinate points, we have...

4=y2

8=y1

3=x2

10=x1

So let's plug this into the equation:

(4-8)/(3-10)= -4/-7, or 4/7

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.