If the computer store sells 200 laptops for $1000 each and 250 netbooks for $200 each. How much total profit does the store make?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.