please help!! it's percent of change, somebody here must know how to do it. it's dividing and some random stuff but i don't know what to do :(( just explain for me please

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?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585