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LUCKY_DIMON [66]
3 years ago
9

Will give brainliest FAST

Mathematics
1 answer:
sleet_krkn [62]3 years ago
7 0
This is the answer I wish you will understand

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Mark bought 12 boxes of paper clips and 10 packages of index cards for a
Nata [24]

Answer:

paper clips = $1.85

index cards = $3.95

Step-by-step explanation:

Mark

12 paper clips = x

10 index cards = y

$61.70 total

Janice

15 paper clips = x

7 index cards = y

$55.40 total

12x + 10y = 61.70

15x + 7y   = 55.40

*** you want to cancel out one of the letters

(12x + 10y = 61.70) * -7

(15x + 7y   = 55.40) * 10

-84x -70y = -431.9

150x + 70y = 554.0

150x + 70y = 554.0

-84x -70y = -431.9

66x + 0 = 122.1

66x = 122.1

x = 122.1 ÷ 66

x = 1.85

plug it back in

15(1.85) + 7y   = 55.40

27.75 + 7y   = 55.40

7y   = 55.40 - 27.75

7y = 27.65

y = 27.65 ÷ 7

y = 3.95

8 0
2 years ago
Evaluate the expression 9-3÷1/3+1 <br>A. 9 <br>B. 3 <br>C. 1 <br>D. 19​
ikadub [295]
PEMDAS
P- none
E- none
M- none
D- (3/1/3=1)
AS- 9-1+1=9

The answer is A.
7 0
2 years ago
4^3x(100/25)-5^0 what is this plz
REY [17]

Answer:

255

Step-by-step explanation:

trust

5 0
2 years ago
Find the sum. Write your answer in simplest form. 3/7 + 2/3​
Delicious77 [7]

Answer:

1 2/21

Step-by-step explanation:

We start out with:

3/7 + 2/3

In order to add them together, they must have an equal denominator. An easy way to find an equal denominator is the cross method. We divide 7 by 3 and 3 by 7, giving us a denominator of 21:

3/21 + 2/21

But what about the numerators? You do the same thing as before (multiplying by the other's denominator).  Now we have:

9/21 + 14/21

We add both together (the denominator stays the same) and we get 23. 23/21 is correct but not in simplest form. We remove 21 from the numerator (because it is a whole) and finally get:

1 2/21!

≧◡≦

Mocha here! If this answer helped you, please consider giving it brainliest because I would appreciate it greatly. Have a wonderful day!

3 0
3 years ago
Find the unit rate for 5 gallons of water in 2 min​
ikadub [295]

Answer:

2.5 gallons per 1 minute

Step-by-step explanation:

A unit rate is a comparison of a value per one. To find the unit rate, write the ratio as 5 gallons per 2 min then divide to find per 1.

\frac{5}{2} = 2.5

2.5 gallons per 1 minute

6 0
3 years ago
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