) A jewelry store purchases necklaces for n dollars each. The necklaces are then marked up by 20%, and customers are charged 5% sales tax on the selling price. The expression n +(20%times n) represents the selling price. Write and simplify an expression to represent the price a customer pays after sales tax is collected. Show your work. Explain the meaning of the expression

Chemistry balance then what type of reaction are they i don't know why it keeps saying math when i put chem

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?

Can someone explain to me how to do