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. (10 points) 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

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.