1)
Per week, let's say she goes to school 5 times a week, which is reasonable. So she spends 5 miles to school*5 days=25 miles for school. But, she needs to drive back, so 2*25 miles for school=50 miles for school. Also, her soccer practice is 2 miles, so it's 2 miles*3 days=6 miles. So the total per week is 50+6=56. But wait! She drives 20 miles on the weekend. So the total per week is 56+20=76 miles. Let's estimate 52 weeks per year, so there would be 39 weeks of school(school is about 3/4 of the year), so there would be 76*39
$\approx$80*40=3200 miles per year. But wait! She still drives in the summer 100 miles per week for about 13 weeks, so the total is 3200+13*100=$\boxed{4500}$ miles per year.
2)
Because 3 miles is 1 kilowatt hour, we have that April spends $\frac{4500}{3}=1500$ kilowatt hours. Because it is 0.12 dollars per kilowatt hour, we have that the electricity cost is $0.12(1500)=\boxed{180}$ dollars on electricity (feel free to round this yourself)
3)
Assuming that Megan lives on a highway and not city, so she gets 25 miles per gallon. So this means Megan spends $\frac{4500}{25}=180$ gallons of gas. Because she spends 2.85 dollars per gallon, her total cost is $2.85(180)=\boxed{513}$ dollars on gas costs (feel free to round this yourself)