Which of the following is an example of a counterexample?
a.) all prime numbers are odd.
b.) prime numbers, except for the number 2, are odd.
c.) the number 17 is a prime number
d.) the numbers 3 and 7 are prime numbers.

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Two numbers have a sum of -19. one number is x. what expression represents the other number?