3 years ago

Please help me out with this I will give brainiest this is the last one I need!

Mathematics

1 answer:

denis23 [38]3 years ago

3 0

Answer:

Step-by-step explanation:

28/16=1.75

35/1.75=20

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the length of a rectangle is 3 meters less than twice the width if the area is 104 square meters find the length

MrRa [10]

X-width
2x-3-length

A=lxw
104=(2x-3)(x)
104=2x^2-3x
52=x^2-3/2(x)
52+9/16=x^2-3/2(x)+9/16
841/16=(x-3/4)^2
29/4=x-3/4
x=32/4 or 8

length is 2(8)-3 which is 13 and width is 8

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Lena spent $39 on fruit at the grocery store. She spent a total of $60 at the store. What percentage of the total did she spend

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Answer:

The answer is 65%

Step-by-step explanation: Divide 60 by 39 and multiply by 100. So it will look like 39/60=0.65*100=65%. I hope this helps. :)

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3 years ago

A stick is broken at a point, chosen at random, along its length. Find the probability that the ratio, R, of the length of the s

Oksanka [162]

Solution :

Let the distance of the stick from one break be X

And let us assume that $X \leq l/2$ .

Here, l = length of stick

Therefore, $$P(X$

We know that, $R=\frac{X}{l-X}$ , so by definition we get

$X =\frac{lR}{1+R}$

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When it starts at zero, then r =0. It ends at one when the r has a maximum

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The probability density function is given by

$\frac{d}{dr}(\frac{2r}{1+r})= \frac{2}{(r+1)^2}$

Now integrating, we find E(R) and $E(R)^2$ gives :

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4 years ago

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Answer:

Below

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● f(10) = -2(10) +3 = -20 + 3 = -17

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