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qaws [65]
4 years ago
10

Please simplify the expression.

Mathematics
1 answer:
IRINA_888 [86]4 years ago
8 0

Answer:

1) 15a - 15c + 3

2) -7n + 31 + 13m + 7p  or  13m - 7n + 7p + 31

3) 44x + 6y + 3

4) 9m - 6n + 23

Step-by-step explanation:

1. Add like terms. 6a + 9a=15a. -8c - 7c=-15c

2. Add like terms. You can rearrange them in descending order based off of exponents and variables.

3. Multiply what's in parentheses first (distribute the 6). It should end up being (6y + 42x). Then you add like terms and put in descending order.

4. Distribute the (-3) to what in the parentheses. It should end up being (-6n + 15 - 3m). Then you add like terms and put the expression in descending order.

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A carpenter purchased 50 ft of redwood and 70 ft of pine for a total cost of $280. A second purchase, at the same prices, includ
iris [78.8K]

The cost per foot of redwood and of pine is $3.5 and $1.5 respectively.

<h3>How to solve simultaneous equation?</h3>

let

  • cost of redwood = x
  • cost of pine = y

50x + 70y = 280

100x + 60y = 440

Multiply (1) by 2

100x + 140y = 560

100x + 60y = 440

subtract to eliminate x

80y = 120

y = 120/80

y = $1.5

substitute y = 1.5 into (1)

50x + 70y = 280

50x + 70(1.5) = 280

50x + 105 = 280

50x = 280 - 105

50x = 175

x = 175 / 50

x = $3.5

Learn more about equation:

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4 0
2 years ago
Express <br> 8.218.21<br> 8.21<br> 8, point, 21<br> as a mixed number.
djverab [1.8K]
8 21/100 is the answer
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3 years ago
Determine the volume of the 3-D solid below. The base has a height of 6 m and a length of 5 m. The solid itself has a height of
Allushta [10]

Answer:

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Step-by-step explanation:

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7 0
3 years ago
80 times 30 plus 60 equals
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Answer:

2460

Step-by-step explanation:

Hope this helps :)

6 0
3 years ago
Read 2 more answers
What value of x satisfies the equation x/6-1/5=7/30
Makovka662 [10]
We need to isolate x in order to find x. However, we need to have common denominators first.
\frac{5x}{30}- \frac{6}{30}  =  \frac{7}{30}
\frac{5x}{30}= \frac{13}{30}
Multiply by 30 on both sides.
5x=13
Divide by 5 on both sides to isolate x.
x= \frac{13}{5}
3 0
4 years ago
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