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3 years ago

Need help asap plssssssses

Mathematics

1 answer:

rjkz [21]3 years ago

6 0

36 min painted 420ft²
1 min——> 420/36
=11 2/3 ft²

∴ 30 mins ——-> 11 2/3 x 30
=350 ft²

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Jason and Marc each bought a new video game for $40.

elena-s [515]

Answer:2.50 more dollars then Marc

Step-by-step explanation:

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2 years ago

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Find all points on the circle (x^2) + (y^2) = 676 where the slope is 5/12

borishaifa [10]

Implicit defferentation

remember that dy/dx y= dy/dx

so
take derivitive of both sides
$2x+2y \space\ \frac{dy}{dx}=0$
solve for $\frac{dy}{dx}$
minus 2x both sides
$2y \space\ \frac{dy}{dx}=-2x$
divide both sides by 2y
$\frac{dy}{dx}=\frac{-2x}{2y}$
$\frac{dy}{dx}=\frac{-x}{y}$

when is the slope equal to $\frac{5}{12}$
solve for $\frac{dy}{dx}=\frac{5}{12}$
$\frac{dy}{dx}=\frac{5}{12}$
$\frac{5}{12}=\frac{-x}{y}$
$5y=-12x$
$y=\frac{-12}{5}x$
find where the circle and this line intersects

substitute $\frac{-12}{5}x$ for y
$x^2+(\frac{-12}{5}x)^2=676$
$x^2+\frac{144}{25}x^2=676$
$\frac{25}{25}x^2+\frac{144}{25}x^2=676$
$\frac{169}{25}x^2=676$
times both sides by $\frac{25}{169}$
$x^2=100$
sqrt both sides, take positive and negative roots
x=+/-10

sub back

$y=\frac{-12}{5}x$
$y=(\frac{-12}{5})(10) \space\ or \space\ (\frac{-12}{5})(-10)$
$y=\frac{-120}{5} \space\ or \space\ \frac{120}{5}$
$y=-24 \space\ or \space\ 24$

the points are (10,-24) and (-10,24)

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3 years ago

What are the slope and the y-intercept of the linear function that is represented by the graph?

amm1812

Answer:

the slope is 4 and the y intercept is 12

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3 years ago

F(x) = 3x^2 how to graph it

maks197457 [2]

Answer:

Step-by-step explanation:

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2 years ago

At Best Buy they have a stereo system that sells for $2200 and is on sale for 15% and sales tax is 7%. What is the final cost? (

Arte-miy333 [17]

Answer:

Final cost = $3070.90

Step-by-step explanation:

First we need to find the discount

Discount = original price * percent off

Discount = 2200 * .15

Discount = 330

Sale price = original price - discount

Sale price = 3200-330

Sale price = 2870

Now we need to calculate tax

Tax = sales price times tax rate

Tax = 2870 * .07

= 200.90

Final price = sales price plus tax

Final price = 2870 + 200.90

3070.90

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3 years ago