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Bond [772]
3 years ago
5

HELP PLEASE . im in credit recovery bc i obviously suck at math im going to post a photo with the question & answers .someon

e pls answer this for me .

Mathematics
1 answer:
Lostsunrise [7]3 years ago
7 0
Girl im on the same boat as you 
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ms.Holloway is putting up a bulletin board about frogs. The bulletin board is 6 feet wide and 4 feet tall. she wants to put a bo
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The distance around the bulletin board would be 20 feet, because you multiply 6ft 2x and 4ft 2x.



6 0
3 years ago
A circle is growing so that the radius is increasing at the rate of 3 cm/min. How fast is the area of the circle changing at the
Naya [18.7K]

Answer:

The area is growing at a rate of \frac{dA}{dt} =226.2 \,\frac{cm^2}{min}

Step-by-step explanation:

<em>Notice that this problem requires the use of implicit differentiation in related rates (some some calculus concepts to be understood), and not all middle school students cover such.</em>

We identify that the info given on the increasing rate of the circle's radius is 3 \frac{cm}{min} and we identify such as the following differential rate:

\frac{dr}{dt} = 3\,\frac{cm}{min}

Our unknown is the rate at which the area (A) of the circle is growing under these circumstances,that is, we need to find  \frac{dA}{dt}.

So we look into a formula for the area (A) of a circle in terms of its radius (r), so as to have a way of connecting both quantities (A and r):

A=\pi\,r^2

We now apply the derivative operator with respect to time (\frac{d}{dt}) to this equation, and use chain rule as we find the quadratic form of the radius:

\frac{d}{dt} [A=\pi\,r^2]\\\frac{dA}{dt} =\pi\,*2*r*\frac{dr}{dt}

Now we replace the known values of the rate at which the radius is growing ( \frac{dr}{dt} = 3\,\frac{cm}{min}), and also the value of the radius (r = 12 cm) at which we need to find he specific rate of change for the area :

\frac{dA}{dt} =\pi\,*2*r*\frac{dr}{dt}\\\frac{dA}{dt} =\pi\,*2*(12\,cm)*(3\,\frac{cm}{min}) \\\frac{dA}{dt} =226.19467 \,\frac{cm^2}{min}\\

which we can round to one decimal place as:

\frac{dA}{dt} =226.2 \,\frac{cm^2}{min}

4 0
3 years ago
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Answer. 15ft can not be painted because 1 gallon= 4 quarts and 4 quarts cant get 15ft u will need 15 gallons=60 quarts

Step-by-step explanation:

4 0
3 years ago
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When 12 is added to a number the result is 32 less than 3 times a number.<br> What is this number?
neonofarm [45]
X - the number

x+12=3x-32 \\&#10;x-3x=-32-12 \\&#10;-2x=-44 \\&#10;x=\frac{-44}{-2} \\&#10;x=22

The number is 22.
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-6 7/8 ÷(-3 3/4). Please help!!!!!!!!!!!!
Irina-Kira [14]

Answer: 67/66

Step-by-step explanation: brainliest plzz:)

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