All categories

2 years ago

Help me please I’m stuck /:

Mathematics

1 answer:

Sloan [31]2 years ago

7 0

Answer:

314.159 square inches

Step-by-step explanation:

The radius is 10 in, just plug it into a formula.

You might be interested in

How can refusal skills help you to avoid danger?

gayaneshka [121]

Answer:

Children who are taught refusal skills are more likely to make positive choices and refrain from engaging in high-risk behaviors

Step-by-step explanation:

5 0

2 years ago

What is three more than the product of a number and 7 equals 8 . use the variable x for the unknown number?

Anastaziya [24]

(7x) + 3 = 8
subtract both sides by 3.

7x = 5
divide both sides by 7 to isolate the variable, x.

x = 5/7

7 0

3 years ago

Suppose that in 6 minutes, 36 gallons of water came out the pipe. what was the rate in

Tom [10]

Answer:

6 gallons in one minute :)

Step-by-step explanation:

3 0

3 years ago

If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate (in cm/min) at which the diameter d

grin007 [14]

Answer:

The diameter decreases at a rate of 0.053 cm/min.

Step-by-step explanation:

Surface area of an snowball

The surface area of an snowball has the following equation:

$S_{a} = \pi d^2$

In which d is the diameter.

Implicit differentiation:

To solve this question, we differentiate the equation for the surface area implictly, in function of t. So

$\frac{dS_{a}}{dt} = 2d\pi\frac{dd}{dt}$

Surface area decreases at a rate of 3 cm2/min

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

Tind 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

$\frac{dS_{a}}{dt} = 2d\pi\frac{dd}{dt}$

$-3 = 2*9\pi\frac{dd}{dt}$

$\frac{dd}{dt} = -\frac{3}{18\pi}$

$\frac{dd}{dt} = -0.053$

The diameter decreases at a rate of 0.053 cm/min.

7 0

2 years ago

The price of an item yesterday was $40. Today, the price fell to $22. Find the percentage decrease.

klio [65]

Answer:

45%

Step-by-step explanation:

40 * .45 = 18

40-18 = 22

7 0

2 years ago