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3 years ago

The sale price of an item is $160 after a 20% discount. What was the original price of the item?

Mathematics

1 answer:

rjkz [21]3 years ago

6 0

Answer:

192$

Step-by-step explanation:

u take 160 * .20 that equals 32 the u add 32 to 160

mark brainliest if want

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Find the derivative of f(x) = 4 divided by x at x = 2.

polet [3.4K]

<h2>Hello!</h2>

The answer is:

$f'(2)=-1$

To solve this problem, first we need to derivate the given function, and then, evaluate the derivated function with x equal to 2.

The given function is:

$f(x)=\frac{4}{x}$

It's a quotient, so, we need to use the following formula to derivate it:

$f'(x)=\frac{d}{dx}(\frac{u}{v}) =\frac{v*u'-u*v'}{v^{2} }$

Then, of the given function we have that:

$u=4\\v=x$

So, derivating we have:

$f'(x)=\frac{d}{dx}(\frac{4}{x}) =\frac{x*(4)'-4*(x)'}{x^{2} }$

$f'(x)=\frac{d}{dx}(\frac{4}{x}) =\frac{x*0-4*1}{x^{2} }$

$f'(x)=\frac{d}{dx}(\frac{4}{x}) =\frac{0-4}{x^{2} }$

$f'(x)=\frac{d}{dx}(\frac{4}{x}) =\frac{-4}{x^{2} }$

Hence,

$f'(x)=\frac{d}{dx}(\frac{4}{x}) =\frac{-4}{x^{2} }$

Now, evaluating with x equal to 2, we have:

$f'(2)=\frac{-4}{(2)^{2} }$

$f'(2)=\frac{-4}{4}$

$f'(2)=-1$

Therefore, the answer is:

$f'(2)=-1$

Have a nice day!

4 0

3 years ago

Read 2 more answers

ANSWER ASAP PLEASE .

o-na [289]

Can there be two answers? or is it just one if not then a and c

7 0

3 years ago

Read 2 more answers

I need help with this I have no idea what graph goes with the equation?

HACTEHA [7]

Answer:

B with E and D with G

Step-by-step explanation:

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3 years ago

Please help<br><br> Boats A, B, C, and D are all the same distance from Boat O.

BlackZzzverrR [31]

Answer:

α = 62°

β = 56°

gamma = 90°

Step-by-step explanation:

ΔAOB is isosceles, so m∠A = m∠ABO = 28

28 + 28 + m∠AOB = 180

m∠AOB = 180 - 28 - 28 = 124

β = 180 - 124 = 56

arcAB = 124

ΔBOC is isosceles. α = m∠BCO = 1/2(arc AB) = 1/2(124) = 62

∠D is inscribed in a semicircle

m∠D = gamma = 90°

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3 years ago

At the yearly fund raising drive, the nonprofit company 's goal was to raise $55,500 each day. After three days it had raised $5

maxonik [38]

This is honestly simple but we all need help! The answer is 55,053. Hope this helps! =3

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3 years ago