If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall? feet.

A teacher who has taught 5 years will make $42000. In 10 years they will make $42840. What is the percent increase that the teacher will make after 5 more years of teaching?

In right triangle ABC, where C is the right angle : b = 12 and B = 33°. Find A, a, and c to the nearest tenth.

Shot put is a track-and-field event where athletes throw a heavy spherical ball. Shot put balls come in various sizes and materials. The diameter of a brass shot put ball is 4.

Kate took a test and she got a grade between 80% and 95%, inclusive. What is the greatest percent error she could have?

2 by 5 into bracket minus 3 by 7 minus 1 by 6 into 3 by 2 + 1 by 4 into 2 by 5?

A box contains 15 balls numbered 1 through 15. Two balls are drawn in succession without replacement. If the second ball has the number 4 on it, what is the probability that the first ball had a smaller number on it? An even number on it?

What is 1/3m-1-1/2n when m=21 and n=12

0.82 times what = 0.0082?

Let a be an irrational number. Is - 24+a rational or irrational?

What is the length of the radius of a circle whose area is 100 pie (3.14) ?