Question

Andrew is showing his work in simplifying −4.5 + 4.2 + 5.6 − 7.3. Identify any errors in his work or in his reasoning. Write feedback to Andrew explaining the mistake he made and how to correct his work.

Answer 1

The bold is incorrect up top and corrected below

Explanation:

(−4.5 + 4.2 + 5.6 − 7.3 Original problem)

(1−4.5 + 4.2 + 5.6 + (−7.3) Additive inverse)

(2−4.5 + (−7.3) + 4.2 + 5.6 Commutative property)

(3(−4.5 + (−7.3)) + (4.2 + 5.6) Associative property)

(4−11.8 + 9.8 Simplify)

(5−21.6 Simplify)

heres what done

−4.5 + 4.2 + 5.6 − 7.3

−4.5 + 4.2 + 5.6 + (−7.3)

−4.5 + (−7.3) + 4.2 + 5.6

(−4.5 + (−7.3)) + (4.2 + 5.6)

-11.8+9.8 = -2