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3 years ago

Anyone know this?????

Mathematics

2 answers:

Alinara [238K]3 years ago

8 0

The answer would be 33

pishuonlain [190]3 years ago

5 0

If I’m not wrong the answer should be 75

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If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases whe

tensa zangetsu [6.8K]

Answer:

The diameter decreases at a rate of -0.0477 cm/min when it is 10 cm.

Step-by-step explanation:

Surface area of a snowball:

A snowball has a spheric format, which means that it's surface area is given by:

$A = 4\pi r^2$

In which r is the radius, which is half the diameter. In function of the diameter, the area is given by:

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

Solving the question:

To solve this question, we have to implicitly derivate the area in function of t. So

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

Snowball melts so that its surface area decreases at a rate of 3 cm2/min

This means that $\frac{dA}{dt} = -3$

Find the rate at which the diameter decreases when the diameter is 10 cm.

This is $\frac{dd}{dt}$ when $d = 10$ . So

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

$-3 = 20\pi\frac{dd}{dt}$

$\frac{dd}{dt} = -\frac{3}{20\pi}$

$\frac{dd}{dt} = -0.0477$

The diameter decreases at a rate of -0.0477 cm/min when it is 10 cm.

5 0

3 years ago

A drawing of the Pittsburgh Airport uses a scale of 1 centimeter = 250 meters. Runway A is drawn 12 centimeters long. How many m

dalvyx [7]

To do this you need to multiply how many centimeters long the drawing is times the number of meters per centimeter used in the scaling.

12 x 250 = 3000

4 0

3 years ago

I know the answer, but I just wanna know if the answer I got was right or wrong, if I'm wrong help down please

evablogger [386]

Answer:

$\frac{8}{10}$

Step-by-step explanation:

$\frac{1}{2} +\frac{3}{10}$

$\frac{5}{10} +\frac{3}{10} =\frac{8}{10}$

Hope this is helpful

7 0

3 years ago

- 0.1 -0.7 I don’t get this?

Nookie1986 [14]

Answer:

-0.8

Step-by-step explanation:

1. When subtracting or adding negative numbers, remember these rules:

Same signs add and keep

Different signs subtract

Keep the sign of the higher number.

2. -0.1 and -0.7 both have the same sign (they're both negative numbers), so add them together.

-0.1 - 0.7 = -0.8

3. The answer is negative based on the rules listed above in step 1.

4 0

3 years ago

Please help me with these 6 questions

nydimaria [60]

Answer:

vanilla=100-74

vanilla=26

chocolate=42

42-26

=16

6 0

3 years ago