Mary is twice as old

as Feodor. In 8 years

their ages will total

70. How old is each

now?

Michael and Lindsey are saving money. Michael begins with $20 and saves $5 per week. Lindsey begins with no money but saves $10 per week. Enter the number of weeks it will take for Lindsey and Michael to save the same amount of money.

Find and interpret the marginal frequencies.

On a recent Saturday, a total of 1086 people visited a local library. Of these people, 269 were under age 10, 466 were aged 10-18, 185 were aged 19-30, and the rest were more than 30 years old. One person is sampled at random.

A company sells desks for $155 each. To produce a batch of x desks, there is a cost of $83 per desk and a fixed or setup cost of $9,300 for the entire batch. Determine a function that gives the profit in terms of the number of desks produced.

Find the perimeter of a triangle xyz (0,2) (4,-1) (-2,-1)