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

There is nothing wrong with Arlene's math. Her answer is correct. The mistake is that she has cited the "associative property" where the "commutative property" should have been cited, and vice versa.

The associative property has to do with where you put parentheses. The commutative property has to do with what order the operands are in.

In step 2 and step 3 reasoning mistakes

Step-by-step explanation:

We are given that Arlene is showing her work in simplifying -7.9+8.2-3.4+2.1

We have to find error and correct the error made by Arlene in her work

Original problem : -7.9+8.2-3.4+2.1

Step 1: -7.9+8.2+(-3.4)+2.1

Additive inverse property

Step 2:-7.9+(-3.4)+8.2+2.1

Using Commutative property   (commutative property a+b=b+a)

Step 3:(-7.9+(-3.4))+(8.2+2.1)

Using associative  property   (Associative property a+(b+c)=(a+b)+c))

Step 4: -11.3+10.3

By Simplification

Step 5:-1

By simplification

Arlene simplify in correct way but she is doing mistake in reasoning in step 2 and step 3.

part d

step-by-step explanation:

theresa talked her parents into getting sd cards for her phone and her brother’s phone. inserting an sd card into a phone gives it more storage. they both get 8-gigabyte sd cards. how many bits of storage come with each sd card? type your answer in both scientific and standard notation.

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.