Sally's dog boarding service currently has 4 Great Danes, 6 golden retrievers, 20 mastiffs, and 12 Doberman Pinschers. What is the ratio of mastiffs to the total number of dogs at Sally's boarding service?

A) 10:21

B) 9:21

C) 21:10

D) 21:9

A computer company claims its laptop has a battery that lasts for hours the laptop actually ran for 200 minutes before the battery ran out did the battery last 4 hours ... ?

Is the gender of college students a discrete random variable

Show that any integer n > 12 can be written as a sum 4r + 5s for some nonnegative integers r, s. (This problem is sometimes called a postage stamp problem. It says that any postage greater than 11 cents can be formed using 4 cent and 5 cent stamps.)

4. A chicken salad recipe calls for pound of chicken per serving. How many pounds of chicken are needed to make 8 servings?

Write it from least to greater 4/8, 1/3, 2/3

the scale of a map is 1 1/2 inches = 50 inches. on the map, 2 rivers are 7 1/2 inches apart. what is the distance between the two rivers?

An engineer estimated the weight of a steel beam to be 600 pounds. The actual weight of the beam was 639 pounds. Find the absolute error and the percent error of the engineer's estimate. If necessary, round your answers to the nearest tenth.

Marta measured the temperature as 65°F. What is the margin of error? a. 60°F to 70°F b. 64°F to 66°F c. 64.5°F to 65.5°F d. 65.5°F to 66.5°F

3/19 of a quantity is equal to nothing of the quantity.

A family has 4 children: Ariel, Bob, Chris, and Diana. Assuming that all birth orders are equally likely. Find the probability that Ariel is older than Diana.