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3 years ago

11

1. A boy needs to be at school by 8:15 am. If it takes him 15

2 answers:

GenaCL600 [577]3 years ago

5 0

Answer:

7:00 am

Step-by-step explanation:

7:00 am

pshichka [43]3 years ago

4 0

Answer:

He would need to get up at 7:00am

Step-by-step explanation:

He would need to get up at 7:00 am because if you add all the times together which would be 15+20+25+15=75 so he would take 1 hour and 15 mins to get ready before school therefor he would be at school exactly at 8:15 am.hope it helps you!

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Svetach [21]

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A 15m long ladder reached a window 9m high from the ground on placing it against a wall at a distance x. Find the distance of th

Ilya [14]

Answer:

12 meters

Step-by-step explanation:

Given That :

Length of ladder = 15m

Height of wall =. 9 m

Using Pythagoras rule :

Adjacent² = hypotenus² - opposite²

Adjacent² = 15² - 9²

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8 0

3 years ago

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.

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3 years ago

Read 2 more answers

Use the tangent ratio to find x in the picture attached.

Sedbober [7]

Sry that I can’t answer but I hope u have a great day
Yxucivb:)

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