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GaryK [48]
3 years ago
8

George and Bella are asked to solve −3x − 30 = 5x + 18. Identify where one of them made an error.

Mathematics
2 answers:
scZoUnD [109]3 years ago
7 0

Answer:

Bella made an error in step 2

Step-by-step explanation:

The given equation is:

-3x-30=5x+18

Rearranging the like terms, we get

⇒-3x-5x=18+30

⇒-8x=48

⇒x=-6

Thus, the correct value of x is -6.

Now, Bella made a mistake in her solution as:

-3x-30=5x+18

⇒−3x − 30 − 3x = 5x + 18 − 3x  (she should add 3x on both sides rather than subtracting)

⇒− 30 = 2x + 18

⇒−30 − 18 = 2x + 18 −18

⇒− 48= 2x

⇒x=-24

Anika [276]3 years ago
4 0
For the second,
In the first step, instead of adding 3x for both sides, they subtract 3x instead.
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Makovka662 [10]

The cost of TV is $ 792 and cost of DVD player is $ 264

<u>Solution:</u>

Given, total cost of television and dvd player = 1056

The cost of the television is three times the cost of the dvd player.  

Now, let the cost of DVD player be "n", then the cost TV will be (1056 – n)

And, we know that, cost of TV is 3 times Cost of DVD

\text { cost of Television } =3 \times \text { cost of DVD }

\begin{array}{l}{1056-n=3 \times n} \\\\ {1056=3 n+n} \\\\ {4 n=1056} \\\\ {n=264}\end{array}

So, the cost of DVD player is $264, the cost of TV will be (1056 - 264) = $792

5 0
3 years ago
To ship a 2 pound package, the company will charge $ and to ship a 3.5 pound package, the company will charge $
blsea [12.9K]

Answer:

"...charges a flat rate of $5.00..." Flat rates in the business world is what we call constants in the mathematical word. That is, if we have a flat rate, that number doesn't change for anything because it has no variable attached to it (unless otherwise noted). You can identify what the constants are because they do not have the tags "per", "each", or "for every" attached to them when in the English language. In this case, this number remains the same no matter if 1 package gets shipped or a 1000 packages get shipped. So, we have the first part of our equation:  

$5.00...

Step-by-step explanation:

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2 years ago
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Lunna [17]

Answer:

3 9/10,64,B,D

Step-by-step explanation:

8 0
2 years ago
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kenny6666 [7]

Answer:

Your answer is 50 degrees.

Step-by-step explanation:

An isosceles triangles base angles are equal.

A triangle's angles add up to be 180 degrees.

65+65+x = 180

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5 0
2 years ago
When sales representatives for a pharmaceutical company drive out of town meetings that require an overnight stay, they receive
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$329=$175+$0.70x
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3 years ago
Read 2 more answers
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