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3 years ago

Find (3a2 - 2a + 4) - (a2 - 3a + 7) .

1 answer:

6 0

(3a^2 - 2a + 4) - (a^2 - 3a + 7) = (distribute the negative sign)
3a^2 - 2a +4 - a^2 + 3a - 7 = (add like terms)
2a^2 + a - 3
So, the answer is A!

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WILL BRAINLEIST IF CORRECT!!!!!!

11Alexandr11 [23.1K]

Answer: -2

Different in Squares: a^2 −b^2 =(a+b)(a−b)

Rad 7^2-3^2 —> Rad 7^2=7 and -3^2= -9

—> 7-9= -2

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3 years ago

Solve the following equation T/4 +7 =2.

Sindrei [870]

Answer:

T=-20

Step-by-step explanation:

first get rid of the 7

1. T/4=-5

then multiply by 4 to isolate T

2. T=-20

4 0

3 years ago

Read 2 more answers

Please find the DIMENSIONS not the total area of both of these rectangles! I’m giving brainliest this is very urgent. Answers wo

7nadin3 [17]

Answer:

Question:14

3x4 (for the left square, 3 on the side(width) and 4 on the bottom(length))

3x9 (for the right square, 3 on the side(width) and 4 on the bottom(length))

3x13 (for the entire rectangle)

Question:15

3x10 (for the left, 3 on the side(width) and 10 on the bottom(length))

3x6 (for the right, 3 on the side(width) and 6 on the bottom(length))

Step-by-step explanation:

5 0

3 years ago

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Working together to palms can drain a certain pool in three hours if it takes the older pump nine hours to drain the pool by its

andreyandreev [35.5K]

Answer:

It would take the newer pump 4.5 hours to drain the pool

Step-by-step explanation:

Let's investigate first what is the fraction of the job done in the unit of time (hour in this case) by each pump if the work individually:

older pump: if it takes it 9 hours to complete the job, it does $\frac{1}{9}$ of the job in one hour.

newer pump: we don't know how long it takes (this is our unknown) so we call it "x hours". Therefore, in the unit of time (in one hour) it would have completed $\frac{1}{x}$ of the total job.

both pumps together: since it takes both 3 hours to complete the job, in one hour they do $\frac{1}{3}$ of the job.

Now, we can write the following equation about fractions of the job done:

The fraction of the job done by the older pump plus the fraction of the job done by the newer pump in one hour should total the fraction of the job done when they work together. That is in mathematical terms:

$\frac{1}{9} +\frac{1}{x} =\frac{1}{3}$

and solving for x:

$\frac{1}{9} +\frac{1}{x} =\frac{1}{3} \\x+9=3x\\2x=9\\x=\frac{9}{2} \,\,hours\\x = 4.5\,\,hours$

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3 years ago

It costs $10.99 per month for an online video streaming service. Jackie watched 28 videos in one month. What was the price per v

Kitty [74]

Answer:

Assuming it's actually charging per video, and not just for a subscription, the cost per video would be .40 (40 cents per movie)

Step-by-step explanation:

10.99 / 28 =

.3925

Which rounded up is .40

3 0

3 years ago