Which expression is equivalent to - 21?

A. 9 - (-12)

B. 9 + (-12)

C. - 9+12

D. - 9-12

Khloe ran around the track 7 times at the same rate of speed. It took her 21 minutes to run. Zachary took 4 minutes to run around the track once. Which student ran faster? Explain.

What is 2/5 of 16 miles?

Given a = {1, 3, 5}, b = {2, 4, 6} and c={1, 2, 3, 4, 5, 6}, then a ∪ (b ∩ c. =

James knows that when he walks, he takes about 120 steps per minute and that each step is 2.75 feet long. which calculation is most reasonable for james to use to find out his walking speed in miles per hour?

Harvard University accepts 6 students for every 100 applicants. How many students will be accepted in 850 applicants apply for admission?

An organic juice bottler ideally produces 215,000 bottles per day. But this total can vary by as many as 7,500 bottles. What is the maximum and minimum expected production at the bottling company?

What is the least common multiple of 21 and 30?

Keith spent half of his allowance at the movies he earned 6 dollars washing the family car what is his weekly allowance if he ended up with 15 dollars

How do the areas of the parallelograms compare? The area of parallelogram 1 is 4 square units greater than the area of parallelogram 2. The area of parallelogram 1 is 2 square units greater than the area of parallelogram 2.

Term insurance has value as an investment. True False