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
i feel like it has to do with 2 okennedy sent a letter to khrushchev declaring that the united states would not permit offensive weapons to be delivered to cuba, and demanded that the soviets dismantle the missile bases already under construction or completed, and return all offensive weapons to the u. s.s. r. the letter was the first in a series of direct and indirect communications between the white house and the kremlin throughout the remainder of the crisis. i feel like she messed up on 2 or 3 but idk why. . i will give stars and points