Much help needed please

Mathematics

2 answers:

alisha [4.7K]2 years ago

6 0

Answer: 0.8

Step-by-step explanation:

Jlenok [28]2 years ago

3 0

There is 9 counters all together and if 2 are picked out at random which are red then it would be 2/9

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When a figure is translated, its orientation (blank) and the measures of its angles (blank).

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Answer:

Its orientation may change and the measures of its angles stay the same.

Step-by-step explanation:

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2 years ago

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Please help, it's very important!

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X/4 < 1.5 show steps please

Alja [10]

Step-by-step explanation:

x/4<1.5
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<h3>stay safe healthy and happy...</h3>

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2 years ago

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: