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3 years ago

What is not equal to the absolute value of -50

Mathematics

1 answer:

noname [10]3 years ago

4 0

The absolute value of -50 is 50

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If 21% of kindergarten children are afraid of monsters, how many out of<br> each 100 are afraid?

Scrat [10]

Answer:

The appropriate answer is "21".

Step-by-step explanation:

Given:

Afraid percentage,

p = 21%

or,

= 0.21

Sample size,

n = 100

As we know,

⇒ $X=np$

By putting the values, we get

$=0.21\times 100$

$=21$

4 0

3 years ago

If a snowball melts so that its surface area decreases at a rate of 5 cm2/min, find the rate (in cm/min) at which the diameter d

rosijanka [135]

Answer:

0.0221 cm/min

Step-by-step explanation:

Surface area of a snowball:

An snowball has a spherical format.

The surface area of an sphere is given by:

$A = 4\pi r^2$

In which r is the radius(half the diameter). So in function of the diameter, we have that:

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

Implicit derivative:

To solve this question, we need to find the implicit derivative of A in function of t.

The variables are A and d, so:

$\frac{dA}{dt} = 8\pi d \frac{dd}{dt}$

Its surface area decreases at a rate of 5 cm2/min

This means that $\frac{dA}{dt} = -5$

Find the rate (in cm/min) at which the diameter decreases when the diameter is 9 cm

This is $\frac{dd}{dt}$ when $d = 9$ . So

$\frac{dA}{dt} = 8\pi d \frac{dd}{dt}$

$-5 = 8\pi*9 \frac{dd}{dt}$

$\frac{dd}{dt} = -\frac{5}{72\pi}$

$\frac{dd}{dt} = -0.0221$

This means that the diameter decreases at a rate of 0.0221 cm/min when the diameter is 9 cm.

6 0

3 years ago

Describe the symmetry of these functions

Oduvanchick [21]

If it was line symmetry it would need to repeat the same shape twice, which the first follows but the second doesn’t.
if it was rotational, you would need to be able to take the shape in the top right and rotate it counterclockwise or clockwise to get the shape that locks in place. that doesn’t follow that.
both line and rotational symmetry is incorrect because the first example would need to lock up inside the right side of that example.

the answer is C

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3 years ago

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What’s the volume of the cylinder

Eduardwww [97]

Answer:753.98

Step-by-step explanation:4^2*15*pie

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4 years ago

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{x | x < 2}<br><br> how do I solve this

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