John is twice as old as Mary. The sum of thelr ages is 21. How old Is Mary?

Fine the area of the kite. a. 90 sq. units b. 9 sq. units c. 180 sq. units d. 45 sq. units

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

The table shows the balance of a money market account over time. write a function that represents the balance y(in dollars) after t years.