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arlene is showing her work in simplifying −7.9 + 8.2 − 3.4 + 2.1. identify any errors in her work or in her reasoning. write feedback to arlene explaining the mistake she made and how to correct her work. step work reasoning
−7.9 + 8.2 − 3.4 + 2.1 original problem
1 −7.9 + 8.2 + (−3.4) + 2.1 additive inverse
2 −7.9 + (−3.4) + 8.2 + 2.1 associative property
3 (−7.9 + (−3.4)) + (8.2 + 2.1) commutative property
4 −11.3 + 10.3 simplify 5 −1 simplify

Julius went on a volunteer trip to centralamerica and took medical supplies with him.he packed a bag with 50 pounds of supplies.he brought pieces of equipment that weighed10 pounds each and bottles of medicine thatweighed pound each prepresents thenumber of pieces of equipment he broughtand b represents the number of bottles ofmedicine he brought then the total weight canbe represented by the equation 10p+b 50.the brought 3 pieces of equipment, how manybottles of medicine did he bring?