anonymous
  • anonymous
help!
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Andrew is showing his work in simplifying (−5.7 + 2.2) − 1.1. Step 1: (2.2 − 5.7) − 1.1 Step 2: 2.2 − (5.7 + 1.1) Step 3: 2.2 − (6.8) Step 4: −4.6 Which statement is true? In step 1, Andrew used the commutative property. In step 2, Andrew used the distributive property. In step 3, Andrew used the associative property. In step 4, Andrew's answer is incorrect. @Vocaloid
Vocaloid
  • Vocaloid
well, he switched the 2.2 and the -5.7, do you know what property that is?
anonymous
  • anonymous
commutative?

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Vocaloid
  • Vocaloid
yup!
anonymous
  • anonymous
so A is the answer?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
two hints: 1. subtract the two numbers 2. distance must be positive that should be enough to find the answer
anonymous
  • anonymous
C?
Vocaloid
  • Vocaloid
subtract...
anonymous
  • anonymous
A?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
yup, much better
anonymous
  • anonymous
)Which statement best explains the value of 12 − (−4)? The additive inverse of −4 is −4, so 12 − (−4) = 16. The additive inverse of −4 is −4, so 12 − (−4) = 8. The additive inverse of −4 is +4, so 12 − (−4) = 8. The additive inverse of −4 is +4, so 12 − (−4) = 16.
Vocaloid
  • Vocaloid
well, when we take the additive inverse, we switch the sign so -4 becomes +4 and 12 -(-4) becomes 12 + 4
anonymous
  • anonymous
d?
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
Vocaloid
  • Vocaloid
just multiply -3/16 times 4
anonymous
  • anonymous
-0.75
Vocaloid
  • Vocaloid
as a fraction, please...
anonymous
  • anonymous
oh okay sorry
anonymous
  • anonymous
-3 /4
Vocaloid
  • Vocaloid
yes, that's your answer
anonymous
  • anonymous
Where is the answer to the expression 5 − 9 located on a horizontal number line? 9 units to the left of 5 9 units to the right of 5 4 units to the right of 5 4 units to the left of 5
anonymous
  • anonymous
anonymous
  • anonymous
-4
Vocaloid
  • Vocaloid
actually, let's think of it another way 5-9 means start at 5 and go left 9
anonymous
  • anonymous
so A?
anonymous
  • anonymous
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
The total charge on 4 particles is −36 units. All the particles have the same charge. What is the charge on each particle? −9 units −8 units 8 units 9 units
Vocaloid
  • Vocaloid
divide: total charge/number of particles
anonymous
  • anonymous
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
well, -6-(-4) = ?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right, now take a look at your answer choices and see which one matches -2
anonymous
  • anonymous
b?
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
Why is 1 + (−5) equal to −4? Because it is 5 units to the right of 1 on a horizontal number line Because it is 5 units to the left of 0 on a horizontal number line Because it is 5 units to the right of 0 on a horizontal number line Because it is 5 units to the left of 1 on a horizontal number line
anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
Vocaloid
  • Vocaloid
1 + (-5) means start at 1 and go left 5
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
Which fraction is equivalent to negative 7 over 8? 8 over negative 7 7 over negative 8 negative 7 over negative 8 7 over 8
Vocaloid
  • Vocaloid
hint: move the negative sign to the denominator
anonymous
  • anonymous
b?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
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anonymous
  • anonymous
Vocaloid
  • Vocaloid
alright, we start with 35, and take away the price of the book and magazine using additive inverses, our equation should look like: 35 + (-price of book) + (-price of magazine)
anonymous
  • anonymous
i got 23 @Vocaloid
Vocaloid
  • Vocaloid
now look at the answer choices and see which one matches...
anonymous
  • anonymous
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
well, all you need to do is divide the two fractions (-6/3) divided by (2)/(-9) = ?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
look at the answer choices first now, our answer will be (total miles) divided by (distance per day) which answer choices matches that description?
anonymous
  • anonymous
b
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
Ryan has a shelf that is 64 over 3 inches wide. How many magazines can Ryan arrange on the shelf if each magazine is 4 over 3 inches thick? 28, because the number of magazines is 64 over 3 ÷ 4 over 3 27, because the number of magazines is 64 over 3 • 4 over 3 16, because the number of magazines is 64 over 3 ÷ 4 over 3 43, because the number of magazines is 64 over 3 ⋅ 4 over 3
anonymous
  • anonymous
Vocaloid
  • Vocaloid
hint: number of magazines = (width of shelf)/(thickness of magazine)
anonymous
  • anonymous
Vocaloid
  • Vocaloid
check your math again
anonymous
  • anonymous
D
Vocaloid
  • Vocaloid
(64/3) divided by (4/3) = ?
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
plug each of them on a calculator and pick the two that don't repeat
anonymous
  • anonymous
what do you mean.. can you give me an example please? @Vocaloid
Vocaloid
  • Vocaloid
start with the first number... 7/4 type 7/4 into a calculator and see if the decimal stops or repeats
anonymous
  • anonymous
Abel opened a bank account. He deposited $63.50 into his account every month for 20 months. He used $40.50 every month to pay for comic books. After 20 months, he used 1 over 2 of the total money left in his account to go to a comic book convention. What is the total amount of money Abel spent to go to the convention? $230.00 $248.00 $460.00 $920.00 @Vocaloid
Vocaloid
  • Vocaloid
ok... he saves 63.50 and spends 40.50 per month, so how much money does he have left every month?
anonymous
  • anonymous
what is the equation for me to solve @Vocaloid
Vocaloid
  • Vocaloid
I want you to think hard about this one... he saves $63.50 and spends $40.50... how much money does he have left?
anonymous
  • anonymous
ok i got c @Vocaloid
Vocaloid
  • Vocaloid
nope, not quite... he has 460 in his account and he spends half on the convention, so how much does he spend on the convention?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
check again... what is half of 460?
anonymous
  • anonymous
A?
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
Michelle earned $150 during the summer for babysitting. She bought 2 packs of Blu-ray disks worth $65 each using her babysitting money. How much money was left after she bought the Blu-ray disks? $20 $85 $215 $280
Vocaloid
  • Vocaloid
what do you think? she starts with 150 and buys two items worth 65 each
anonymous
  • anonymous
Tiara's gym membership, which is $42, is deducted automatically from her bank account every month. Which expression shows the total deductions for the year? (−$42) ÷ 12 (−$42) + 12 (−$42) − 12 (−$42) ⋅ 12
anonymous
  • anonymous
Vocaloid
  • Vocaloid
total deductions = (-monthly deduction)*number of months
anonymous
  • anonymous
okay
anonymous
  • anonymous
An underground subway elevator descends 12% of the total depth every minute. The total depth of the elevator is 75 meters below the ground. How many meters below the ground is the elevator after 2 minutes? –18 meters –9 meters –4.5 meters –22.5 meters @Vocaloid
Vocaloid
  • Vocaloid
first calculate 12% of 75 (0.12*75) = ?
anonymous
  • anonymous
i got 9 @Vocaloid
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right, so in 1 minute it is -9 meters now, what about 2 minutes?
anonymous
  • anonymous
-18
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
step 1, the division changed to multiplication without flipping the second fraction
anonymous
  • anonymous
1 Attachment
Vocaloid
  • Vocaloid
(3/5) divided by (-4/9) = ?
anonymous
  • anonymous
7/45
anonymous
  • anonymous
Vocaloid
  • Vocaloid
check your math again rmember, when we divide two fractions, we flip the second fraction over (3/5) / (-4/9) = (3/5)*(9/4) = ?
Vocaloid
  • Vocaloid
(3/5) / (-4/9) = (3/5)*(-9/4) = ?
anonymous
  • anonymous
oh! i got 27/20
anonymous
  • anonymous
is it negative or postitive?
Vocaloid
  • Vocaloid
(3/5)*(-9/4) = -27/20 because of the negative sign on -9
anonymous
  • anonymous
ok!
anonymous
  • anonymous
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anonymous
  • anonymous
Vocaloid
  • Vocaloid
hint: the negative sign disappeared somewhere, what step did it disappear in?
anonymous
  • anonymous
step 2 @Vocaloid
anonymous
  • anonymous
Vocaloid
  • Vocaloid
correct, so there's the error
anonymous
  • anonymous
Tucker earned $12.50 walking dogs on Saturday. On Sunday, he spent $6.95 when he purchased a movie ticket. He needed to borrow money from a friend to complete his purchase of a snack. How much money did Tucker pay for the snack if he owes his friend $5? $5.55 $7.50 $10.55 $24.45 @Vocaloid
anonymous
  • anonymous
Vocaloid
  • Vocaloid
alright... ignore the snack for now, just answer this first he started off with 12.50 and spent 6.95, how much does he have left?
anonymous
  • anonymous
Vocaloid
  • Vocaloid
right, now we need to add 5 to that to find the price of the snack
anonymous
  • anonymous
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anonymous
  • anonymous
Vocaloid
  • Vocaloid
again, we'll be using division number of servings = (total number of cups)/(serving size) look at the answer choices and see which one matches

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