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2 years ago

Help this is due tmr!!

Mathematics

1 answer:

Mumz [18]2 years ago

4 0

Answer:

A is correct

Step-by-step explanation:

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Expand the following:<br> a) x(x - 6)<br> b) x(4x + 1)<br> c) 2x(5x + 4)<br> d) 3x(5x - y)

puteri [66]

Answer:

Step-by-step explanation:

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3 years ago

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webassign If a snowball melts so that its surface area decreases at a rate of 6 cm2/min, find the rate at which the diameter dec

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.

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3 years ago

Will mark brainliest!<br> Solve!<br> 9x +25+3x = 34 + 54<br> HELP!!!

Salsk061 [2.6K]

Answer:

9x + 25 + 3x = 34 + 54

9x + 3x = 12x

34 + 54 = 88

12x + 25 = 88

- 25 - 25

12x = 63

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3 years ago

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Yanka [14]

ANSWER:

1791018.01445

EXPLANATION:

Use long multiplication to evaluate

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3 years ago

I have 7 mins to turn in, what’s the answer?? thanks :)

Ostrovityanka [42]

Answer:

A) x = 10-/3, y = 20

Step-by-step explanation:

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3 years ago