What do these equal to? 2 3/4 + 1 1/5 = ?
3 1/2 - 2 5/9 = ?
2 1/5 + 1 3/4 = ?
1 1/2 + 2 3/5 = ?
3 1/2 + 2 2/3 = ?
5 1/2 + 5 1/4 = ?
1 10/11 - 1 1/3 = ?
1 5/12 + 3 1/3 = ?

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?