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2 years ago

2×+3(×-4)=8 what the answer to this problem

Mathematics

2 answers:

Musya8 [376]2 years ago

6 0

Answer:

x=4

Step-by-step explanation:

you must first distribute the 3 into the (x-4). then you have 2x+3x-12=8. Then you combine like terms meaning you add 2x and 3x together and have 5x. Now you have 5x-12=8. Then add 12 on both sides so now you have 5x= 20 and finally you have to divide both sides by 5 and then your answer is x=4

Contact [7]2 years ago

3 0

Answer:

Step-by-step explanation:

2x+3(x-4)=8

2x+3x-12=8

5x-12=8

5x-12+12=8+12

5x=20

5x/5=20/5

x=4

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2 years ago

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4 0

2 years ago

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asambeis [7]

$\bf \qquad \qquad \textit{double proportional variation}\\\\
\begin{array}{llll}
\textit{\underline{y} varies directly with \underline{x}}\\
\textit{and inversely with \underline{z}}
\end{array}\implies y=\cfrac{kx}{z}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\$

$\bf \begin{cases}
p=pedalisi\\
w=weight\\
s=\textit{sitting height}
\end{cases}\quad 
\begin{array}{llll}
%pelidisi, varies directly as the cube root of a person's weight in grams and inversely as the person's sitting height in centimeters.
\textit{pelidisi varies directly}\\
\textit{as cube root of weight}\\
\textit{and inversely to }\\
\textit{sitting height}
\end{array}\implies p=\cfrac{k\sqrt[3]{w}}{s}\\\\
-------------------------------$

$\bf \textit{we know that }
\begin{cases}
w=48,820\\
s=78.7\\
p=100
\end{cases}\implies 100=\cfrac{k\sqrt[3]{48820}}{78.7}
\\\\\\
100\cdot 78.7=k\sqrt[3]{48820}\implies \cfrac{7870}{\sqrt[3]{48820}}=k
\\\\\\
thus\qquad \boxed{p=\cfrac{\frac{7870}{\sqrt[3]{48820}}\sqrt[3]{w}}{s}}
\\\\\\
\textit{now, what is \underline{p} when }
\begin{cases}
w=54,688\\
s=72.6
\end{cases}?\implies p=\cfrac{\frac{7870}{\sqrt[3]{48820}}\sqrt[3]{54688}}{72.6}$

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