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3 years ago

A classmate writes and incorrect proportion to find x. Explain and correct the error.

Mathematics

1 answer:

SpyIntel [72]3 years ago

6 0

Answer:

x / 9 = 12 / 15

Step-by-step explanation:

Correct proportion by given same angle;

x / 9 = 12 / 15

x = (12)(9) / 15

x = 108 / 15

x = 7.2 unit

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The length of a room is 18

Virty [35]

Question:

The length of a room is 18 1 /2 feet. If using 1 /4 inch = 1 foot scale, what would be the length of a wall on a blueprint of a floor plan?

Answer:

The length of a wall on a blueprint of a floor plan is $4.625 \text{ or } 4\frac{5}{8} \text{ inches }$

Solution:

Given that,

$Length\ of\ room = 18\frac{1}{2} \text{ feet }\\\\Length\ of\ room = 18.5 \text{ feet }$

The scale given is:

$\frac{1}{4}\ inch = 1\ foot$

To find: Length of a wall on a blueprint of a floor plan

Let "x" be the length of a wall on a blueprint of a floor plan

Then from given,

$\frac{1}{4}\ inch = 1\ foot\\\\x\ inches = 18.5\ feet$

This forms a proportion and we can solve by cross multiplying

$\frac{1}{4} \times 18.5 = x \times 1\\\\x = 4.625\\\\In\ terms\ of\ mixed\ fraction,\\\\x = 4\frac{5}{8}$

Thus length of a wall on a blueprint of a floor plan is $4.625 \text{ or } 4\frac{5}{8} \text{ inches }$

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3 years ago

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The line of reflection is y=

Trava [24]

Answer:

$y = \frac{1}{-1}x + 0$ $or$ $y = \frac{1}{-1}x$

Step-by-step explanation:

$y = mx + c$

$m = \frac{y_{2} -y_{1}}{x_{2} - x_{1} } }$

$(x_{1},y_{1}) = (-1,1)\\(x_{2},y_{2}) = (-2,2)$

$m = \frac{2 - 1}{(-2) - (-1)}$

$m = \frac{2 - 1}{-2 +1 }$

$m = \frac{1}{-1}$

$c = 0$

$y = \frac{1}{-1}x + 0$ $or$ $y = \frac{1}{-1}x$

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3 years ago

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Temka [501]

$214.60-15=199.60
199.60/20= 9.98
Each cd was $9.98

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3 years ago

−6(x+7) pls help me.

QveST [7]

The answer is -6x - 42

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3 years ago

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A store sells gift boxes. Their medium gift box is a cube with side lengths of s=5 inches. Customers want to know how much the g

timofeeve [1]

The volume of the cube

V = s^3

Where s is the side length

V = s^3

V = 5^3

V = 125 cu in

Surface area of cube

A = 6s^2

Where s is the side length of the cube

A = 6s^2

A = 6(5^2)

A = 6(25)

A = 150 sq in

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3 years ago

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