Pls ! 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. the way she did it was 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

no one knows lol

step-by-step explanation:

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!