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3 years ago

I dont understand this problem. Could someone explain it to me?

Mathematics

1 answer:

IRINA_888 [86]3 years ago

8 0

Answer:

additive property

Step-by-step explanation:

it is because when you ADD the angles it is EQUAL to the answer

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Please answer number 5

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Answer:

35 Cubic Centimeters

Step-by-step explanation:

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I’m pretty sure it’s choice 3

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3 years ago

Plzz help me solve questions 15 and 16...!!

iVinArrow [24]

15.

We have right triangles, with the ladder the hypotenuse of both and the wall the opposite side of both.

Call the ladder length h.

Against the wall we have the opposite of alpha the taller one:

$q = h \sin \alpha - h \sin \beta$

On the ground adjacent to beta is the longer one

$p = h \cos \beta - h \cos \alpha$

Dividing

$\dfrac p q = \dfrac{ h \cos \beta - h \cos \alpha }{h \sin \alpha - h \sin \beta} = \dfrac{ \cos \beta -\cos \alpha }{\sin \alpha - \sin \beta} \quad\checkmark$

16.

Again I'm too lazy to draw the figure but you should.

Let's call y the height of the tower and x the distance from the observation point on the ground to the base of the tower.

$\tan 60^\circ = \dfrac y x$

$\tan 30^\circ = \dfrac{y - 40}{x}$

Since $\sin 30 =\cos 60 = \frac 1 2 \textrm{ and } \cos 30 = \sin 60 = \sqrt{3}/2$

$\tan 60^\circ = \sqrt{3} = y/x$

$\tan 30^\circ = 1/\sqrt{3} = (y-40)/x$

Dividing,

$\sqrt{3}/ (1/\sqrt{3}) = (y/x) / ((y-40)/x)$

$3 = y/(y-40)$

$3y - 120 = y$

$2y = 120$

$y = 60$

$x = y/\sqrt{3} = 60(\sqrt{3}/3) = 20 \sqrt{3}$

Answer: Height 60 meters, distance 20√3 meters

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4 years ago

Rectangle ABCD is similar to rectangle FGHI what is the value of x?

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The value of x is 14 I think

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3 years ago

color copies cost 10 cents per copy and white copies cost 5 cents per copy. sandy made 400 copies, some of which were colored an

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The answer is 80 copies

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