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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
well, he switched the 2.2 and the -5.7, do you know what property that is?
so A is the answer?
two hints: 1. subtract the two numbers 2. distance must be positive that should be enough to find the answer
yup, much better
)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.
well, when we take the additive inverse, we switch the sign so -4 becomes +4 and 12 -(-4) becomes 12 + 4
just multiply -3/16 times 4
as a fraction, please...
oh okay sorry
yes, that's your answer
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
actually, let's think of it another way 5-9 means start at 5 and go left 9
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
divide: total charge/number of particles
well, -6-(-4) = ?
right, now take a look at your answer choices and see which one matches -2
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
1 + (-5) means start at 1 and go left 5
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
hint: move the negative sign to the denominator
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)
i got 23 @Vocaloid
now look at the answer choices and see which one matches...
well, all you need to do is divide the two fractions (-6/3) divided by (2)/(-9) = ?
look at the answer choices first now, our answer will be (total miles) divided by (distance per day) which answer choices matches that description?
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
hint: number of magazines = (width of shelf)/(thickness of magazine)
check your math again
(64/3) divided by (4/3) = ?
plug each of them on a calculator and pick the two that don't repeat
what do you mean.. can you give me an example please? @Vocaloid
start with the first number... 7/4 type 7/4 into a calculator and see if the decimal stops or repeats
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
ok... he saves 63.50 and spends 40.50 per month, so how much money does he have left every month?
what is the equation for me to solve @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?
ok i got c @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?
check again... what is half of 460?
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
what do you think? she starts with 150 and buys two items worth 65 each
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
total deductions = (-monthly deduction)*number of months
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
first calculate 12% of 75 (0.12*75) = ?
i got 9 @Vocaloid
right, so in 1 minute it is -9 meters now, what about 2 minutes?
step 1, the division changed to multiplication without flipping the second fraction
(3/5) divided by (-4/9) = ?
check your math again rmember, when we divide two fractions, we flip the second fraction over (3/5) / (-4/9) = (3/5)*(9/4) = ?
(3/5) / (-4/9) = (3/5)*(-9/4) = ?
oh! i got 27/20
is it negative or postitive?
(3/5)*(-9/4) = -27/20 because of the negative sign on -9
hint: the negative sign disappeared somewhere, what step did it disappear in?
step 2 @Vocaloid
correct, so there's the error
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
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?
right, now we need to add 5 to that to find the price of the snack
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