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jek_recluse [69]

3 years ago

14

Help me with this question

1 answer:

ch4aika [34]3 years ago

7 0

1. Point (8, 35 ) is on the curve that lead us to: 95th percentile.
2. 20 year old boys, 5th percentile is 165 cm tall.
3. 15 year old boy, 25th percentile, mass= 64 kg.
4. BMI = Mass(kg)/(Height(m))^2, Mass=89 kg, Height=1.85 m
BMI= $\frac{89}{ 1.85^{2} }= \frac{89}{3.4225}=26.004382$
Answer: BMI=26

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Alex17521 [72]

Answer:

a) 952

b) 136

Step-by-step explanation:

<u>Ratio of b:g = 3:4, based on this we have:</u>

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Number of girls = 4x
Total number of pupils = 3x+4x = 7x

<u>Number of spectacle wearers:</u>

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<u>Number of those not wearing spectacles:</u>

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7 0

3 years ago

Read 2 more answers

A parabola can be represented by the equation x2 = -20y.

aliya0001 [1]

Answer:

$\mathrm{Parabola\:focus\:given}\:x^2=-20y:\quad \left(0,\:-5\right)$

Step-by-step explanation:

Given the equation

$x2 = -20y$

A parabola is the locus of points such that the distance to a point the focus equals the distance to a line the directrix.

$4p\left(y-k\right)=\left(x-h\right)^2$ is the standard equation for an up-down facing parabola with vertex at (h, k), and a focal length |p|.

so

$x^2=-20y$

$\mathrm{Switch\:sides}$

$-20y=x^2$

$\mathrm{Factor\:}4$

$4\cdot \frac{-20}{4}y=x^2$

$4\left(-5\right)y=x^2$

$\mathrm{Rewrite\:as}$

$4\left(-5\right)\left(y-0\right)=\left(x-0\right)^2$

$\left(h,\:k\right)=\left(0,\:0\right),\:p=-5$

Parabola is symmetric around the y-axis and so the focus lies a distance\ p from the center (0, 0) along the y-axis.

$\left(0,\:0+p\right)$

$=\left(0,\:0+\left(-5\right)\right)$

$\mathrm{Refine}$

$\left(0,\:-5\right)$

Therefore,

$\mathrm{Parabola\:focus\:given}\:x^2=-20y:\quad \left(0,\:-5\right)$

Please check the attached figure too.

6 0

3 years ago

Read 2 more answers