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Kaylis [27]
3 years ago
5

Find the sum and choose the correct answer.2n 3 + 4n 2 - 7 and -n 3 + 8n - 9

Mathematics
2 answers:
Delvig [45]3 years ago
7 0
N<span><span><span>​3</span><span>​​</span></span>+4<span>n<span><span>​2</span><span>​​</span></span></span>+8n−16
  hope helped
</span>
Salsk061 [2.6K]3 years ago
4 0

Answer:

The correct answer for the sum is : n^{3} + 4n^{2} + 8n -16

Step-by-step explanation:

We start by adding each n term, n3 with n3 and the same with n2, n and then numbers

(2n^{3} + 4n^{2} -7 ) +  ( -n^{3} + 8n -9)

(2-1)n^{3}

(4+0)n^{2}

(8+0)n

(-7-9)

n^{3} + 4n^{2} + 8n -16

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Suppose a room is 5.2 m long by 4.3m wide and 2.9 m high and has an air conditioner that exchanges air at a rate of 1200 L/min.
Readme [11.4K]

Answer:

54 minutes

Step-by-step explanation:

From the question, we are given;

  • A room with dimensions 5.2 m by 4.3 m by 2.9 m
  • The exchange air rate is 1200 L/min

We are required to determine the time taken to exchange the air in the room;

First we are going to determine the volume of the room;

Volume of the room = length × width × height

                                  = 5.2 m × 4.3 m × 2.9 m

                                  = 64.844 m³

Then we should know, that 1 m³ = 1000 L

Therefore, we can convert the volume of the room into L

= 64.844 m³ × 1000 L

= 64,844 L

But, the rate is 1200 L/min

Thus, time = Volume ÷ rate

                  = 64,844 L ÷ 1200 L/min

                   = 54.0367 minutes

                   = 54 minutes

Therefore, it would take approximately 54 minutes

4 0
3 years ago
Can someone solve this problem
mina [271]

Answer:

y = -2x + 5

Step-by-step explanation:

slope-intercept form: y = mx + b

Hope this helps:)

5 0
3 years ago
What is length of BC ?
MAXImum [283]

Answer:

BC = 10

Step-by-step explanation:

Since this is an isosceles triangle

AC = BC

3x-5 = 2x

Subtract 3x from each side

3x-5-3x = 2x-3x

-5 = -x

Multiply each side by -1

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BC = 2x

     =2 *5

BC =10

5 0
2 years ago
Астоито са
valkas [14]

Answer:

He can make 2 burgers given the amounts

Step-by-step explanation:

If he has 2 lbs of turkey meat, and it takes 1 pound to make one burger, he could make 2 burgers.

2/1 = 2

Hope this helps! Please mark brainliest if correct

6 0
3 years ago
Read 2 more answers
Marcus earns 15% commission on his total sales at work.
IrinaVladis [17]

Answer:

Option C

Step-by-step explanation:

Given the following question:

Total cost is $725
15% Marcus makes in commission.

In order to find the answer, we have to find 15% of $725 and that number will be the total in commissions he earned that week.

\frac{15\times725}{100} =15\times725=10875\div100=108.75

Marcus makes "$108.75" or option C in commissions last week.

Hope this helps.

5 0
2 years ago
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