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3 years ago

Find the x value 7x-1+6x-1=180

Mathematics

2 answers:

Ede4ka [16]3 years ago

3 0

430 but I don’t auctally know

aleksley [76]3 years ago

3 0

Answer:

Step-by-step explanation:

Let's take it step-by-step

7x-1+6x-1=180

We move all terms to the left:

7x-1+6x-1-(180)=0

We add all the numbers together, and all the variables

13x-182=0

We move all terms containing x to the left, and all other terms to the right

13x=182

x=182/13

x=14

So remember, we move all terms to the left. We add all the numbers together, and all the variables. And we move all terms containing x to the left, and all other terms to the right.

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Given that 7x+50=22 find x

GenaCL600 [577]

The value of X is -4

please see the attached picture for full solution

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3 years ago

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Vesnalui [34]

Answer:

Step-by-step explanation:

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2 years ago

What is three quarters of £42 and a quarter of £42

maksim [4K]

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3 years ago

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Write money amounts using a leading zero if necessary & with 2 decimal places (For example: 0.80 or 0.72 or 1.23)

goldenfox [79]

9514 1404 393

Answer:

63 mph
3 donut holes per kid
$0.70 per pound
$2.25 per km

Step-by-step explanation:

In this context, "per" and "for" mean "divided by."

630 mi/(10 h) = 63 mi/h
(24 dh)/(8 kid) = 3 dh/kid
$3.50/(5 lb) = $0.70 /lb
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2 years ago

A pharmacist has an 18% alcohol solution and a 40% alcohol solution. How much of each should he mix together to make 10 liters o

ladessa [460]

X = amount of the 18% solution

y = amount of the 40% solution

we know the 18% solution has only 18% of alcohol, the rest is maybe water or something, now, how many liters is 18%? well, 18% of anything is just (18/100) * anything, so, 18% of x is just (18/100) *x or 0.18x, and that's how many liters are there.

likewise, how many liters are there in the 40% solution? well, (40/100) * y, or 0.4y, that many.

we know the mixture has to yield 10 liters at 20% alcohol, how many liters of only alcohol is that? well, (20/100) * 10, or 2 liters.

$\bf \begin{array}{lccclll}
&\stackrel{liters}{amount}&\stackrel{alcohol~\%}{quantity}&\stackrel{liters}{alcohol}\\
&------&------&------\\
\textit{18\% solution}&x&0.18&0.18x\\
\textit{40\% solution}&y&0.40&0.4y\\
------&------&------&------\\
mixture&10&0.20&2
\end{array}$

$\bf \begin{cases}
x+y=10\implies \boxed{y}=10-x\\
0.18x+0.4y=2\\
----------\\
0.18x+0.4\left( \boxed{10-x} \right)=2
\end{cases}
\\\\\\
0.18x-0.4x+4=2\implies -0.22x=-2
\\\\\\
x=\cfrac{-2}{-0.22}\implies x=\cfrac{100}{11}\implies x=9\frac{1}{11}$

how much of the 40% solution? well y = 10 - x

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3 years ago