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3 years ago

Which expression correctly represents the perimeter of a rectangle that is 12 centimeters long and 7 centimeters wide?

Mathematics

2 answers:

Maurinko [17]3 years ago

5 0

Answer: $2(12\ cm)+2(7\ cm)$

Step-by-step explanation:

We know that the formula to find the perimeter of a rectangle is given b y:-

$P=2(l+w)$ , where l is length and w is width.

Then, the expression that correctly represents the perimeter of a rectangle that is 12 centimeters long and 7 centimeters wide will be :-

$P=2(12\ cm+7\ cm)\\\\=2(12\ cm)+2(7\ cm)$

Hence, D is the correct option.

iren2701 [21]3 years ago

3 0

D.
That is what i do 12 x 2 will equal 24 since the are 2 parallel sides like in a rectangle. and it will be the same concept on the other side 7 x 2 = 14 and 24 + 14 will equal 38
hope this helped and is how you are supposed to work it

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Answer:

Option 3 - $y=-6x+28$

Step-by-step explanation:

Given : Perpendicular to the line $x - 6y = 8$ ; containing the point (4,4).

To Find : An equation for the line with the given properties ?

Solution :

We know that,

When two lines are perpendicular then slope of one equation is negative reciprocal of another equation.

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Converting into slope form $y=mx+c$ ,

Where m is the slope.

$y=\frac{x-8}{6}$

$y=\frac{x}{6}-\frac{8}{6}$

The slope of the equation is $m=\frac{1}{6}$

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The required slope is $m_1=-\frac{1}{\frac{1}{6}}$

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$y=-6x+28$

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