Write an expression for each statement to represent the quantity in terms of its context. 1. A car rents for $35 per day plus 15 cents per mile driven.
2. The sum of three consecutive even integers.
3. One-fifth of the sum of r and 7 minus the product of 9 and s.
4. On a farm, the number of cows is 70 more than half the number of goats and sheep.