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3 years ago

15

The work of a student to solve the equation 2(3x − 4) = 8 + 2x + 4 is shown below:

1 answer:

Lorico [155]3 years ago

8 0

Answer:

step 2; 6x-8=12+2x; she added instead of multiplying

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Find the sum of 6a - 5b + c, -2a +4b -2c

Sphinxa [80]

Answer:

4a-b-c

Step-by-step explanation:

we first look at the letters of each number. if there is only a letter, there is an imaginary 1 in front of it. we need to make sure that we add the numbers that have the exact same letters because they are known as like terms. we cannot add 6a and 4b because the letters are different and they are known as unlike terms. When we add numbers with the same letter ONLY the number changes

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2 years ago

Four less than five times a number is equal to 11

SVETLANKA909090 [29]

5*3=15
15-4= 11
hope I helped:)

7 0

3 years ago

Geometry geometry geometry help help

Leokris [45]

Answer:

what is it asking you? don't just show the problem tell us what needs to be done.

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3 years ago

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A rectangular prism has dimensions of 3x, 5x, and 6x. Write an expression for the total volume of the prism.

Evgesh-ka [11]

90because u multiple 3x in 5x equal to 15 then multiple 6x in 15x together equal to 90 prism

3 0

3 years ago

Read 2 more answers

to arrive at 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution. How many liters of eac

CaHeK987 [17]

Answer:

<u>800 liters</u> of 90% saline solution and <u>1200 liters</u> of 40% saline solution should be used.

Step-by-step explanation:

Given:

At 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution.

Now, to find the number of liters of saline solution each should be used.

<u><em>Let the liters of 90% saline solution mix be </em></u> $x.$ <u><em /></u>

<u><em>And let the liters of 40% saline solution mix be</em></u> $y.$

So, the total number of liters:

$x+y=2000.$

$y=2000-x\ \ \ ....(1)$

Now, the total percentage of saline solution:

$90\%\ of\ x+40\%\ of\ y=60\%\ of\ 2000$

$\frac{90}{100}\times x+\frac{40}{100}\times y=\frac{60}{100}\times 2000$

$0.9x+0.4y=1200$

Substituting the value of $y$ from equation (1) we get:

$0.9x+0.4(2000-x)=1200$

$0.9x+800-0.4x=1200$

$0.5x+800=1200$

Subtracting both sides by 800 we get:

$0.5x=400$

Dividing both sides by 0.5 we get:

$x=800.$

<u>The liters of 90% saline solution mix = 800.</u>

Now, substituting the value of $x$ in equation (1) to get the liters of 40% saline solution:

$y=2000-x$

$y=2000-800$

$y=1200.$

<u>Thus, the liters of 40% saline solution = 1200.</u>

Therefore, 800 liters of 90% saline solution and 1200 liters of 40% saline solution should be used.

8 0

3 years ago