A teacher had 21 red pens. if the ratio of red pens to blue pens owned was 3:1 how many pens did she have in total

What is the conversion factor to convert kilometers to miles?

A hemispherical tank is filled with water and has a diameter of 15 feet. If water weighs 62.4 pounds per cubic foot, what is the total weight of the water in a full tank, to the nearest pound?

4. In Texas, sales tax is 8 cents for every dollar spent. How much will you owe in sales tax if you buy an item worth $100?

the lenght of a painting is 2 inches longer than the width. the area is of the painting is 48 in2. If a 3 inch frame is put around the painting what is the area of the frame

a circle has a radius of 2 cm. find the length s of the arc intercepted by a central angle of 1.9 radians.

Write an equivalent expression to - 2 (1.5h+5) - 4 (-0.5+3h)

Write 5 * 5 * 5 * 5 using exponents. A. 55 B. 54 C. 52 D. 45

How many 1/8 are in 1/2

A box or laundry detergent is on sale for $6.50. If this price represents a 40% discount from the original price, what is the original price to the nearest cent?

Of a group of students 5/8 of them are boys. The girls are put into groups so that each group has 1/6 of the total number of students. How many groups of girls are there?