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kolbaska11 [484]
3 years ago
7

What is the standard form for y=3x+11?

Mathematics
2 answers:
zalisa [80]3 years ago
5 0
I think the answer is 3x-y=11

ladessa [460]3 years ago
4 0
It would be -3X+y=11
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The surface area of a melting snowball decreases at a rate of3.8cm2/min. Find the rate at which its diameter decreases when the
Scorpion4ik [409]

Answer:

Step-by-step explanation:

This is a pretty basic related rates problem. I'm going to go through this just like I do in class when I'm teaching it to my students.

We see we have a snowball, which is a sphere. We are talking about the surface area of this sphere which has a formula of

S=4\pi r^2

In the problem we are given diameter, not radius. What we know about the relationship between a radius and a diameter is that

d = 2r so

\frac{d}{2}=r Now we can have the equation in terms of diameter instead of radius. Rewriting:

S=4\pi(\frac{d}{2})^2 which simplifies to

S=4\pi(\frac{d^2}{4}) and a bit more to

S=\pi d^2 (the 4's cancel out by division). Now that is a simple equation for which we have to find the derivative with respect to time.

\frac{dS}{dt}=\pi*2d\frac{dD}{dt} Now let's look at the problem and see what we are given as far as information.

The rate at which the surface area changes is -3.8, and we are looking for \frac{dD}{dt}, the rate at which the diameter is changing, when the diameter is 13. Filling in:

-3.8=\pi(2)(13)\frac{dD}{dt} and solving for the rate at which the diameter is changing:

-\frac{3.8}{26\pi}=\frac{dD}{dt} and divide to get

\frac{dD}{dt}=-.459\frac{cm}{min} Obviously, the negative means that the diameter is decreasing.

7 0
3 years ago
justin was trying to figure out how to write the expression 7 less than 'the double of twenty five. help justin write the expres
Amanda [17]
The double of 25 is (25+25), or (25x25). 7 less would be (25+25) -7. Figure out what 25 + 25 is, then subtract 7 from your answer.
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ozzi

Answer:

<u>5%</u>

Step-by-step explanation

50/32= 1.56yard per second        ; 50/31= 1.61 yard per second

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3 years ago
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Multiply both sides by negative four to get rid of the fraction

j+18=-32

subtract 18

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5. A history lecture hall class has 15 students. There is a 15% absentee rate per class meeting.
Tasya [4]

Answer:

I think the answer is A

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Step-by-step explanation:

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