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3 years ago

7

I don't get 7/8n-3=5/8n+12??

2 answers:

Natali [406]3 years ago

5 0

Hey there, subtract 5/8n from both sides, 7/8n-3-5/8n+12-5/8n=1/4n-3=12, add 3 to both sides, 1/4n-3+3=12+3=1/4n=15, multiply both sides by 4, 4*1/4n=4*15, 4*15=60. So, n=60

stepan [7]3 years ago

4 0

7/8n - 3 = 5/8n + 12
(7n)/8 - 3 = (5n)/8 + 12
7n - 24 = 5n + 96
7n = 5n + 96 + 24
7n = 5n + 120
7n - 5n = 120
2n = 120
n = 120/2
n = 60

The answer is: n = 60

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Step-by-step explanation:

to find the surface area we need to find the followng areas:

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And once we have those areas, we add them to find the surface area.

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where $l$ is the length of the side: $l=5in$

thus the area of the square is:

$a_{square}=(5in)^2$

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Area of the triangles:

the are of 1 triangle is given by

$a_{triangle} =\frac{b*h}{2}$

where $b$ is the base of the triangle: $b=5in$ (the base of the triangle is the side of the square)

and $h$ is the height of the triangle: $h=6in$

thus, the area of 1 triangle is:

$a_{triangle} =\frac{(5in)*(6in)}{2}$

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the area of the 4 triangles is (we multiply by 4):

$a_{4-triangles}=4(15in^2)$

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finally we add the area of the square and the area of the 4 triangles to find the total surface area:

$Surface=25in^2+60in^2$

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