Which pair of numbers is relatively prime?

7 and 21

4 and 15

6 and 9

9 and 27

What is 15 of 250% percent of what number

The number of goldfish in a tank is 19, and the volume of the tank is 52 cubic feet. What is the density of the tank? 0.22 goldfish per cubic foot 0.27 goldfish per cubic foot 0.33 goldfish per cubic foot 0.37 goldfish per cubic foot

36 cans of soda coast $8.90 how much does 12 cans cost

Which proportion can be used to convert 22 kilograms to grams

From a boat on the lake, the angle of elevation to the top of a cliff is 24 degrees 19'. If the base of the cliff is 2994 feet from the boat, how high is the cliff (to the nearest foot) ?

After deductions of $45 were withheld this week from Ed's weekly earnings on his part-time job, his take-home pay was $240. Ed had worked 30 hours this week. How much did Ed earn per hour?

omposite figure is divided into two congruent trapezoids, each with a height of 4 cm. 2 trapezoids. Both trapezoids have base lengths of 10 centimeters and 6 centimeters, and a height of 4 centimeters.

During a day a student spends 7 hours sleeping, ¹/4 of the day studying and of the time travelling. What fraction of the day is left for other things?

Simplify (x-5) (x^2-2x-6)

Is 0.05 ... irrational?