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3 years ago

11

An electronics store buys a television at a wholesale price of $120. The store then sells the television to its customers for $3

00. What percent of the wholesale price is the selling price?

1 answer:

algol [13]3 years ago

7 0

180% from the selling price to the wholesale

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Find the area of the figure below

Serhud [2]

Easy

the easiest way is to imagine that you have a rectangle with a corner cut off
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area that was cut off was a triangle

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area of triangle=1/2base times height

so we draw imaginary lines like in attachment
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fgiga [73]

Answer:

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Step-by-step explanation:

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3 years ago

Show tan(???? − ????) = tan(????)−tan(????) / 1+tan(????) tan(????)<br> .

anyanavicka [17]

Answer:

See the proof below

Step-by-step explanation:

For this case we need to proof the following identity:

$tan(x-y) = \frac{tan(x) -tan(y)}{1+ tan(x) tan(y)}$

We need to begin with the definition of tangent:

$tan (x) =\frac{sin(x)}{cos(x)}$

So we can replace into our formula and we got:

$tan(x-y) = \frac{sin(x-y)}{cos(x-y)}$ (1)

We have the following identities useful for this case:

$sin(a-b) = sin(a) cos(b) - sin(b) cos(a)$

$cos(a-b) = cos(a) cos(b) + sin (a) sin(b)$

If we apply the identities into our equation (1) we got:

$tan(x-y) = \frac{sin(x) cos(y) - sin(y) cos(x)}{sin(x) sin(y) + cos(x) cos(y)}$ (2)

Now we can divide the numerator and denominato from expression (2) by $\frac{1}{cos(x) cos(y)}$ and we got this:

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And simplifying we got:

$tan(x-y) = \frac{tan(x) -tan(y)}{1+ tan(x) tan(y)}$

And this identity is satisfied for all:

$(x-y) \neq \frac{\pi}{2} +n\pi$

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2 years ago

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barxatty [35]

Answer:

Step-by-step explanation:

Given that,

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dalvyx [7]

Answer:

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