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Mathematics

1 answer:

Makovka662 [10]4 years ago

3 0

To find the area of a cylinder, use the formula pi(r)^2 x h
We're solving for r
108=pi(r)^2 x 12
/12 /12
9=pi(r)^2
/pi /pi
2.87=r^2
$\sqrt{x}$ 2.87= r
1.69

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(please show your answer. thank you)

kondaur [170]

The correct option is: A. 80 cm³

Explanation

Diameter of the coin, $d= 2.0$ cm.

So, the radius, $r= \frac{d}{2} = \frac{2.0}{2} = 1.0$ cm.

As the coin is circular, so..

Area of each circular surface, $A= \pi r^2 = \pi (1.0)^2 = \pi$ cm²

Now for finding the amount of plastic for making each coin, we will find the Volume of each coin first.

As the thickness ( $h$ ) of the coin is 0.5 cm, so Volume of each coin,

$V= A*h \\\\= \pi*0.5 \\\\= 3.14159... * 0.5 \\\\ = 1.5707963... cm^3$

As you need to make a batch of 50 coins, so the total volume of 50 coins $= (1.5707963...*50 )= 78.53981... = 80$ [Rounded up to the nearest multiple of 10 cm³]

So, the amount of plastic you will need for making a batch of 50 coins is 80 cubic centimeter.

8 0

3 years ago

I send this question as an apology to Katie coz I noticed that he or she has been deleting all my content so am sorry if I viola

Yuri [45]

Yeah, Katie sometimes delete mines too. But till date, I haven't posted something which is bad

5 0

3 years ago

HR contains six red chili beans for green jellybeans and four blue jelly beans if we choose a jellybean then another jellybean w

Zigmanuir [339]

Probability first one is blue is 4/6+4+4=4/14
the second one is also blue is 4-1/6+4+4-1=3/13

The probability of getting blue both time is 4/14*3/13=12/182=0.0659=6.59%

Answer:
0.0659 or 6.59%

7 0

4 years ago

Find the equation of the line parallel to x+3y = 4 and passing through the point (2, 5)

dmitriy555 [2]

Answer:

The equation of the parallel line is x + 3y = 17

Step-by-step explanation:

Parallel lines have the same slopes and different y-intercept

The form of the equation y = m x + b, where