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Liono4ka [1.6K]
3 years ago
12

The following steps are used to rewrite the polynomial expression, 3(x + 4y) + 5(2x - y).

Mathematics
1 answer:
ExtremeBDS [4]3 years ago
6 0

i hope this helps! let me know if i got it wrong

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Over the last three evenings, Jane received a total of 123 phone calls at the call center. The second evening, she received 4 ti
vovikov84 [41]

Answer:

13,88,22

On the first evening Jamie received 13 calls.

Step-by-step explanation:

Total number of phone calls received by Jamie over three evenings = 123

Let the number of phone calls received on the third evening = x.

The number of phone calls received on the second evening = 4*x.

The number of phone calls received on the first evening = x-9

Expressing in equation form:

\[x+4x+x-9=123\]

\[=>6x-9=123\]

\[=>6x=132\]

\[=>x=\frac{132}{6}\]

\[=>x=22\]

So Jamie received 22 calls on the third evening, 88 calls on the second evening and 13 calls on the third evening.

6 0
3 years ago
Round each decimal to the nearest whole number 6.7
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5 and up, raise it up
4 and below, keep it low!
7.0
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4 years ago
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Robert and his friends are going into a grocery store. How much would it cost to buy 4 bananas and 5 peaches if each banana cost
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Answer:

4*0.40+5*0.75=5.35

Step-by-step explanation:

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3 years ago
Th e library fi ne for an overdue DVD is $2 for the fi rst day plus $0.25 for each additional day. How many days overdue is a DV
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The DVD is 6 days overdue
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Please answer fast, it's important... Q) find the volume of cube whose dimensions are (x+7y), (7x-y) and (xy-5).​
Alona [7]

Answer:

Volume = 7x^3y+48x^2y^2-7xy^3 -35x^2-240xy-35y^2

Step-by-step explanation:

Given

Shape: Cube

Dimension: (x+7y), (7x-y) and (xy-5).​

Required

Determine the volume

The volume is calculated by multiplying the dimensions:

Volume = (x+7y) * (7x-y) * (xy-5)

Evaluate the first 2 brackets

Volume = [x(7x-y)+7y(7x-y)] * (xy-5)

Volume = [(7x^2-xy)+(49xy-7y^2)] * (xy-5)

Volume = [7x^2-xy+49xy-7y^2] * (xy-5)

Volume = [7x^2+48xy-7y^2] * (xy-5)

Open brackets

Volume = xy[7x^2+48xy-7y^2] -5[7x^2+48xy-7y^2]

Volume = 7x^3y+48x^2y^2-7xy^3 -35x^2-240xy-35y^2

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3 years ago
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