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Lyrx [107]
2 years ago
7

Find the perimeter of a rectangle whose sides are 8 1/2cm by 4 1/2cm.​

Mathematics
2 answers:
Lana71 [14]2 years ago
5 0

Answer:

26 cm

Step-by-step explanation:

To find the perimeter with the side lengths, you can use this formula: 2(L+W) because it's the measure of the distance around the rectangle. So,

2(8.5+4.5)

2(13)=26

spayn [35]2 years ago
4 0

Answer:26

Step-by-step explanation:

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Find the point P on the line yequals4x that is closest to the point (51 comma 0 ). What is the least distance between P and (51
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Answer:

Step-by-step explanation:

Use the distance formula D = √[ (x - x0)² + (y - y0)² ], using (x0, y0):  (51, 0).  Replace 'y' with '4x':

D = √[ (x - 51)² + (4x - 0)² ], or (after simplification)

D = √[ x² - 102x + 2601) + 16x² ], or  D = √[ 17x² - 102x + 2601 ].

This is the objective function in terms of one variable (x).

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We want the x value at which this distance D is a minimum.  We can find that x value by finding the minimum of 17x² - 102x + 2601), whose graph is that of a parabola with minimum at x = -b/(2a).  Here, that x is x = 102/(34), or x = 3.  

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