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4 years ago

What is the value of x?

Mathematics

2 answers:

ArbitrLikvidat [17]4 years ago

8 0

First, set up an equation:
(10x-20) + (6x+8) = 180

Then, solve for x:
16x - 12 = 180
16x = 192
x = 12

Tom [10]4 years ago

4 0

10x - 20 + 6x + 8 = 180
16x - 12 = 180
16x = 192
x = 12

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Answer plzzzzzz ’’’’’’

ioda

Answer:

Step-by-step explanation:

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3 years ago

Now that Oakland Auto Reapir has a different owner, its mechanics make $14.20 per hour. That is 25.1% less than they originally

Serhud [2]

Answer:

$18.96

Step-by-step explanation:

Now the mechanics earn $14.2 per hour, which is 25.1% less than before.

If we say that the earnings before were 100% (to facilitate our calculation and understand better), now the earrings are (100-25.1)%=74.9%. This is, now they make the 74.9% of what they used to made.

So:

74.9% = 14.2

Let's multiply both sides by 100%/74.9% to make a 100% appear at the left side (see that multiply and divide by 74.9 will make it desapear):

74.9% *(100%/74.9%) = 14.2 * (100%/74.9%)

100% = 14.2 * (100%/74.9%)

And (100%/74.9%) is equal to 1/0.749, they are the same. So:

100% = 14.2 * 1/0.749

100% = 18.96

So, before the new manager they used to make $18.96. (you can verify by multiplying it by 74.9% and the result is 14.2)

4 0

3 years ago

What is the quotient if<br> 1/3 of 10 is divided by 1/7 of 8/12? Reduce if possible.

GalinKa [24]

Answer:

2.75

Step-by-step explanation:

7 0

3 years ago

What fraction of 200 gallons is 171 L? Give your answer in simplest form. 1 gallon = 4.5 L.

MrRa [10]

Answer:

757.08 is your answer

Step-by-step explanation:

Hope this helped!

Sorry for not answering sooner :(

6 0

3 years ago

Which expression is equivalent to 60 Σ n=1 (2n − 1)2 ? Check all that apply.

Hunter-Best [27]

9514 1404 393

Answer:

B, D

Step-by-step explanation:

The quadratic expands to ...

(2n -1)² = (2n)² +2(2n)(-1) +(-1)² = 4n² -4n +1

The coefficients can be factored out of the sum, so ...

∑(4n²) = 4∑n² for example

The sum of 60 ones is 60:

$\displaystyle\sum_{n=1}^{60}{1}=1+1+1+\dots+1=60$

So, the sum can be written as ...

$\displaystyle\sum_{n=1}^{60}{(2n-1)^2}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+\sum_{n=1}^{60}{1}}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+60}$

_____

It appears that the key to choosing the correct answers is paying attention to signs.

7 0

3 years ago

Read 2 more answers