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.

Step Work Reasoning
−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

Answer 1

help

Answer 2

halp

Answer 3

halp

Answer 4

hint: −11.8 + 9.8 = ?

Answer 5

negitive 1

Answer 6

use a calculator if you are unsure

Answer 7

https://www.google.com/search?q=google+calc&oq=google+calc&gs_l=psy-ab.3..0j0i131k1j0j0i131k1.38.493.0.509.5.3.0.0.0.0.167.253.1j1.2.0....0...1.1.64.psy-ab..3.2.253...35i39k1j0i67k1j0i20k1.GJmJTEl4-3c

Answer 8

negitive 2

Answer 9

good

so that means Andrew's error is in step 5. he should have wrote −11.8 + 9.8 = -2 not - 21.6 because he messed up the sign

Answer 10

ok

Answer 11

-11

Answer 12

_

Answer 13

we already said the answer was -2

Answer 14

i know i was looking for my _ sign

Answer 15

negitive sign

Answer 16

_