Work the following exercises in JavaScript.

1. Look up the formula for calculating the volume of a sphere. What is the volume of a sphere with radius 4?

2. Suppose the cover price of a book is $24.95 but bookstores get a 40% discount. Shipping costs $3 for the first copy and 75 cents for each additional copy. What is the total wholesale cost for 60 copies.

3. If I leave my house at 6:47 am and run 1 mile at an easy pace (9:30 per mile), then 3 miles at tempo (8:15 per mile) and 1 mile at an easy pace again, what time do I get home for breakfast?