Mary's age is twice the sum of John's age and 3. The sum of both ages is 21 years. Find the age of each one.

5! (3!) / 4! all include factorials. what to do?

Drew has 32 toy cars. He trades 7 of those cars for 11 more toy cars. How many toy cars does Drew have now?

The weight of an object on the moon is 1/6 of its weight on Earth. If a moon rock weighs 20 1/2 lb on Earth, how much did the rock weigh on the moon?

How do you know that 50 is not a perfect square?

A physics book is 1.5 inches thick. How many books would it take to make a stack 2 yards high?

substitute the given values into the formula & solve for the unknown variable A = bh; A = 12, b = 4

If i leave my house at 6:52 am and run 1 mile at an easy pace (8:15 per mile), then 3 miles at tempo (7:12 per mile) and 1 mile at easy pace again, what time do i get home for breakfast?

Each day, Tally's baby sister eats 1/4 cup of rice cereal in the morning and 1/4 cup rice cereal in the afternoon. It will take Tally's sister A. 2 days to eat 2 cups of rice cereal. B. 3 C. 4

What is 129 multiply by 75

Log6 1/36 natural log or base 10 log?