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3 years ago

What is the mean of 987,982

1 answer:

3 0

The mean is the average of the two numbers. It can be calculated by adding the two numbers then dividing the answer by 2.

Therefore:
mean = (987+982) / 2 = 984.5

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Joe bought 16 pounds of flour for $7.<br> How many pounds of flour did he get per dollar?

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Answer:

112

Step-by-step explanation:

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3 years ago

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Jenny will have 46 left over

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If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate at which the diameter decreases whe

mixas84 [53]

Answer:

The diameter decreases at the rate of 0.0796 cm/min when the diameter is 10 cm.

Step-by-step explanation:

A snowball is spherical, so it's area is given by the following formula:

$A = 4\pi r^{2}$

The radius is half the diameter so:

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

$A = 4\pi \frac{d^{2}}{4}$

$A = \pi d^{2}$

If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate at which the diameter decreases when the diameter is 10 cm.

We have to find $\frac{dd}{dt}$ when $\frac{dA}{dt} = -5, d = 10$

$A = \pi d^{2}$

Applying implicit differentiation:

We have to variables(A and d), so:

$\frac{dA}{dt} = 2\pi d \frac{dd}{dt}$

$-5 = 2\pi (10) \frac{dd}{dt}$

$\frac{dd}{dt} = -\frac{5}{20\pi}$

$\frac{dd}{dt} = -0.0796$

The diameter decreases at the rate of 0.0796 cm/min when the diameter is 10 cm.

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4 years ago

For what value of x will (x-1)(x+2)/x+2 be undefined

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Using the property that anything over 0 is undefined, we can set x+2 to 0 and solve it to find the undefined points.
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So when x is -2, the equation will be undefined because of the rules about division by zero.

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