Tommy is twice as old as his younger sister. The sum of the siblings' ages is 21. Which equation can be used to determine the age of Tommy's younger sister?

How much do you need to substract from 57/10 to make 5?

Is 2 yards greater than 5 feet explain

Write the expression in complete factored form. 2a (u+2) + 9 (u+2) =

If you will spend at most $23 and so far you have spent $14 what are possible amounts you will spend in an inequality

Use two different computations (one involving the Poisson and another the exponential random variable) to determine the probability that no job will arrive during the next 15 minutes.

A train traveling at 30 miles per hour reaches a tunnel which is 9 times as long as the train. If the train takes 2 minutes to completely clear the tunnel, how long is the train in miles? (1 mile = 5,280 feet)

The cost for 7 dance lessons is $82. the cost for 11 is $122. write a linear equations to find the total cost C for L dance lessons. How much for 4 lessons?

What is 9.09 repeating as a fraction?

The number of gallons of water in a tank that already has 300 gallons in it after being filled at 35 gallons per minute for m minutes

The Tennis Teams of Atlanta need to older tennis balla for the upcoming tournament. They will need 2,367 tennis balls. If each can hold 5 tennis balls, how Many will they purchase