Determine whether each expression is equivalent to x2 over 5

What numbers are included in the set of integers? what numbers are not included?

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?