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solmaris [256]
3 years ago
7

A pair of corresponding side of two similar pentagons have length of 12cm and 28cm

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
5 0
The ratio of their areas = 12^2 / 28^2
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The number of letters in Stephanie's full name is sixteen less than twice the number of letters in Amy's full name. If the numbe
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Answer:

19 letters

Step-by-step explanation:

Suppose Number of Amy's full name letters = X

               Number of Stephanie's full name letters = Y

Now, according to given condition that ''number of letters in Stephanie's full name is sixteen less than twice the number of letters in Amy's full name'',

Equation 1 becomes

Y = 2X-16

Now, according to second condition, product of their names' letter is 418. So,

Equation 2 becomes

XY = 418

Deducing value of X from equation 1,

X = (Y+16)/2

Putting this value in equation 2 we get,

{(Y+16)/2}*Y = 418,

By simplifying this equation we get a quadritic equation

(Y^2)+16Y-836=0

By breaking middle term (You can use quadratic formula here as well)

(Y^2)+38Y-22Y-836=0

Y(Y+38)-22(Y+38)=0

(Y-22)(Y+38)=0

At this stage we have two values for Y,

Y=22, or Y=-38

Now considering only positive value since the number of letters in a name can not be in negative number,

Y=22,

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Answer: A) y=-8x+5

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Step-by-step explanation:

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