A type of electric car can travel 5 on 1 kilowatt hour of electricity. How many kilowatt hours of electricity would it take Helen to drive her electric car to her aunts house and back? Helen lives 70 miles from her aunt.

28 kwh

Step-by-step explanation:

given that the care can travel 5 miles on 1 kwh, i.e

5 miles travelled > uses 1 kwh

hence to find the unit rate:

1 mile travelled > Uses 1 kwh ÷ 5 = 1/5 kwh

We are also given that Helen lives 70 miles away from her aunt.

Hence a return trip (i.e "to aunts house and back"), will be 70 x 2 = 140 miles

using the unit rate that we found above, we can find the number of kwh that is used to travel 140 miles

140 miles = 140 miles x unit rate

= 140 x 1/5

= 28 kwh

x+14

step-by-step explanation: