answer:A cougar sleeps for 4 hours at night, so in one week it sleeps for 4 * 7 = <<4*7=28>>28 hours. A zebra sleeps for 2 hours more than a cougar, so it sleeps for 4 + 2 = <<4+2=6>>6 hours at night. In one week, a zebra sleeps for 6 * 7 = <<6*7=42>>42 hours. Therefore, both animals sleep for 28 + 42 = <<28+42=70>>70 hours in one week. 70 The answer is: 70

answer:The total distance of the marathon is 26 miles. There are two checkpoints that are each one mile away from the start and finish lines, so the total distance covered by these two checkpoints is 1 + 1 = 2 miles. Therefore, the remaining distance between the checkpoints is 26 - 2 = 24 miles. Since there are four checkpoints, the distance between each consecutive checkpoint is 24 / 4 = 6 miles. So, each of the consecutive checkpoints between the start-finish line are 6 miles apart. 6 The answer is: 6

answer:If each salesperson sells 10 cars per month, then the total number of cars sold per month is 10 * 10 = 100 cars. If there are 500 cars for sale, then it will take 500 / 100 = 5 months for the sales professionals to sell all of the cars. 5 The answer is: 5

answer:We can pair the terms as follows: begin{align*} (-1 + 2) + (-3 + 4) + (-5 + 6) + dots + (9999 + 10000) &= 1 + 1 + 1 + dots + 1 &= 10000. end{align*} There are 5000 pairs of terms, so the sum is 5000 cdot 1 = boxed{5000}.The answer is: 5000