In how many ways can we pick a group of 3 different numbers from the group 1, 2, 3..., 500 such that one number is the average of the other two? (The order in which we pick the numbers does not matter).

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so,about which interval is it approximately symmetric?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?