The second flight of stairs is three times as high as the first flight of stairs. Together they are 72 feet high. How high is the first flight of stairs?

Sarah sent half of the Christmas cards to her friends, and Richard sent three eights of them to his friends. If there are 32 cards in all and Sarah and Richard want to send an even number of cards to their families.

If 36 is 25% of the total, what is the total?

Jasmine finished the bike trail in 2.5 hours at an average rate of 2.5 miles per hour. Lucy biked the same trail at a rate of 6 1/5 mile per hour. How long did it take lucy to bike the trail?

Select the correct inverse function of f (x) = ex. f (x) = ex f (x) = ln x f (x) = logbx f (x) = ln10x

Algebraic expression 6 times a number, n

A waiter in a restaurant places two rectangular dining tables side by side as shown in the figure. What is the perimeter of the top surface formed by joining the two tables? A. 38.5 feet B. 49 feet C. 42 feet D. 35 feet

Two numbers differ by 30. If 15 is added to the smaller, the result exceeds half the larger number by 7 1/2. What are the numbers

Is the graph of 6x2 - 2y = 7 a line? Explain.

Factors of 48 that add to equal 26

Jill starts to make a cake using the ratio 3:4. She measure her cake mix and only has 2 cups. How much water will she need to add in order to keep the ratio the same?