Find the sum of the interior angle measures of a convex 21-gon

You are trying to catch a train, which will be leaving in 2 minutes. There are 2 kilometers between you and the train station.

My son is trying to figure out how to decompose 8/12 and what he has to work with is x/2 + x/2 = 8/12

96x42=4,032 so 42x96=

A soundproofing tile is made of 8 identical solid right pyramids with square bases. The length of the whole tile is x inches.

Find all the factors of 28 the first 6

Two boxes have the same volume. One box has a base that is 2 inches by 2 inches. The other box has a base that is 4 inches by 4 inches. How many times as tall is the box with the smaller base?

How would you add parentheses and brackets to make this sentence true: 45/2x4.7-4.4x6=54

A triangle has side lengths of 5, 9, and 12. Determine whether the triangle is right, acute, or obtuse. A triangle has side lengths of 5, 9, and 12. Determine whether the triangle is A. right B. acute C. obtuse

A cone has a diameter of 6 cm and a height that is five times the diameter using 3.14 for pie which of the following can be used to calculate the volume of the cone

Which of the following is the best estimate for the height of a ceiling? 9 inches 9 feet 9 yards 9 miles