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3 years ago

Which of the following represents "two times the sum of a number and fifteen is equal to six times the number"?

2 answers:

6 0

Answer: 2(N+15) = 6N

======

We let N be the number.
Then, "<span>the sum of a number and fifteen" would be

N + 15

Two times this sum would give us

2(N+15) ... you must distribute!

This must be equal to six times the number. Six times the number is 6N, therefore

2(N+15) = 6N</span>

Gnoma [55]3 years ago

3 0

Answer:

2(N+15) = 6N

Step-by-step explanation:

I took the test

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What is the following expression when simplified 5x + 8(5 + 2x)?

denpristay [2]

Answer:

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Step-by-step explanation:

5x+8(5+2)

5x+8(7)

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[Geometry Basics] I'm just checking if this is correct:

Leno4ka [110]

$\bf ~~~~~~~~~~~~\textit{middle point of 2 points }
\\\\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~ x &,& y~) 
% (c,d)
&&(~ -9 &,& -1~)
\end{array}\qquad
% coordinates of midpoint 
\left(\cfrac{ x_2 + x_1}{2}\quad ,\quad \cfrac{ y_2 + y_1}{2} \right)
\\\\\\
\left( \cfrac{-9+x}{2}~~,~~\cfrac{-1+y}{2} \right)=\stackrel{midpoint}{(8,14)}\implies 
\begin{cases}
\cfrac{-9+x}{2}=8\\\\
-9+x=16\\
\boxed{x=25}\\
-------\\
\cfrac{-1+y}{2} =14\\\\
-1+y=28\\
\boxed{y=29}
\end{cases}$

$\bf -------------------------------\\\\
\begin{array}{ccccccccc}
&&x_1&&y_1&&x_2&&y_2\\
% (a,b)
&&(~ x &,& y~) 
% (c,d)
&&(~10 &,& 12~)
\end{array}\qquad
\\\\\\
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\begin{cases}
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\boxed{x=2}\\
-------\\
\cfrac{12+y}{2} =9\\\\
12+y=18\\
\boxed{y=6}
\end{cases}$

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3 years ago

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solmaris [256]

Answer:

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