Mathematics, 11.02.2020 22:53, jadahilbun01

Angie is showing her work in simplifying −7.9 + 8.2 − 3.4 + 2.1. Identify any errors in her work or in her reasoning.

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 Commutative property
3 [−7.9 + (−3.4)] + (8.2 + 2.1) Associative property
4 −11.3 + 10.3 Simplify
5 −1 Simplify
She did not make any errors.
Step 1: She wrote −3.4 incorrectly as + (−3.4).
Step 2: She identified changing the order of the numbers as the commutative property, which is incorrect.
Step 3: She identified changing the grouping of the numbers as the associative property, which is incorrect.

Answers: 2

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 22:10, bejaranobella07

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

Answers: 2

continue

Mathematics, 22.06.2019 00:30, genesis0523

What line represents the relationship between r and s

Answers: 1

continue

Mathematics, 22.06.2019 00:50, jasmine77723

How does the graph of y = 3x compare to the graph of y = 3-x?

Answers: 1

continue

Mathematics, 22.06.2019 04:00, ciarrap552

Suppose the equation of a line is 2x − 4y = − 8. which coordinate pair represents the y-intercept?