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1 year ago

(6 + 7) + 8 = 21

Mathematics

1 answer:

Mamont248 [21]1 year ago

7 0

Answer:

6 + (7 + 8) = 21

Step-by-step explanation:

the associative property of addition is: (a + b) + c = a + (b + c)

So the equivalent addition sentence would be:

(6 + 7) + 8 = 6 + (7 + 8) as they both equal 21

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La solución a la ecuación 3x-12=5(x-2) es

alexandr1967 [171]

Answer:

x=-1

Step-by-step explanation:

3x−12=5(x−2)

3x+−12=(5)(x)+(5)(−2)(Distribute)

3x+−12=5x+−10

3x−12=5x−10

Step 2: Subtract 5x from both sides.

3x−12−5x=5x−10−5x

−2x−12=−10

Step 3: Add 12 to both sides.

−2x−12+12=−10+12

−2x=2

Step 4: Divide both sides by -2.

$\frac{-2x}{-2}=\frac{2}{-2} }$

x=-1

espero que esto ayude :)

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3 years ago

Which of the following best describes the equation below y=5x+6

Olin [163]

N.linear! hope this helps!

4 0

3 years ago

An office remodeling job takes 5 & 1/2 days to complete. Before working

Oksana_A [137]

Answer: The percent of the estimated time is the actual time is about 14%.

Step-by-step explanation:

As per given,

Actual time of completing the job = $5\dfrac{1}{2}\text{ days}=\dfrac{11}{2}\text{ days}$

Estimated time for completing the job = $4\dfrac{3}{4}\ \text{days}=\dfrac{19}{4}\ \text{days}$

The percentage error is given by:-

$\%\text{ error}= \dfrac{|\text{Estimated-Actual}|}{\text{Actual}}\times100$

$=\dfrac{|\dfrac{19}{4}-\dfrac{11}{2}|}{\dfrac{11}{2}}\times100\\\\\\=\dfrac{|\dfrac{19-22}{4}|}{\dfrac{11}{2}}\times100\\\\\\=\dfrac{|\dfrac{-3}{4}|}{\dfrac{11}{2}}\times100\\\\\\=\dfrac{\dfrac{3}{4}}{\dfrac{11}{2}}\times100\\\\\\=\dfrac{3\times2}{11\times4}\times100\\\\\approx14\%$

The percent of the estimated time is the actual time is about 14%.

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Answer:

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Step-by-step explanation:

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