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3 years ago

12

By switching service providers, a family's telephone bill decreased from about $50 a month to about $47 a month. What was the pe

rcent decrease?

2 answers:

AysviL [449]3 years ago

5 0

100 divided by 50 is 2.
So multiply the change by 2, so 2 times 3.

Answer is 6 percent.

Nataly_w [17]3 years ago

5 0

The answer is by 6 percent

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drek231 [11]

Answer:

The answer is $\frac{3}{10\pi } cm/min$

Step-by-step explanation:

Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:

$A=4\pi r^{2} = 4\pi (\frac{D}{2} )^{2} =\pi D^{2}$

Differentiating wrt r we have:

$\frac{dA}{dD} =2\pi D$

We are told that $\frac{dA}{dt}= -6$ and we want to find $\frac{dD}{dt}$

By the chain rule we have:

$\frac{dA}{dD}=\frac{dA}{dt}.\frac{dt}{dD}=\frac{\frac{dA}{dt} }{\frac{dD}{dt} }$

∴ $2\pi D=-\frac{6}{\frac{dD}{dt} }$

∴ $\frac{dD}{dt}=-\frac{6}{2\pi D}$

When D=10 then

$\frac{dD}{dt} =-\frac{6}{10*2\pi } =-\frac{3}{10\pi }$

The sign (-) shows that the D is decreasing.

3 0

3 years ago

What is 0.6767 as a simplified fraction

vodka [1.7K]

Answer: 6767/10000

Step-by-step explanation:

Just simplify it by its nearest tenth

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3 years ago

Help with this question anyone?

Art [367]

Adding 49 will explain it properly just do that and you will get the answers

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malfutka [58]

1? Or dividend or multiplication

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2 years ago

Read 2 more answers

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salantis [7]

Answer:

I might be wrong double check but it's something like

Step-by-step explanation:

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(not to sure on that so don't be mad if it's wrong)

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