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Vaselesa [24]
3 years ago
10

What is the surface area of a cylinder with a height of 3 and a radius of 7?

Mathematics
1 answer:
saveliy_v [14]3 years ago
3 0
Break up the problem into two parts:  1) find the surface area of the sides of the cylinder and 2) find the surface area of the top or bottom and multiply your result by 2.

Part 1:  Imagine that you cut the side of the cylinder parallel to its axis once and then open up this shape to form a rectangle.  The length of this rectangle is equal to the circumference of the cylinder times the height/length of the cylinder parallel to its axis:  A1 = 2 pi (7 units) (3 units), or 42 pi square units.

Part 2:  The total area of the two ends of the cylinder is 2 (pi [7 units]^2), or 98 pi square units.

Add these two areas together to get the total surface area of the cylinder.
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What interger is equivalent to 9 1/2
photoshop1234 [79]

Answer:

None

Step-by-step explanation:

There is no integer equivalent to 91/2, integers can't have a decimal.

However, I assume you would like me to answer 9.5, even though it isn't an integer.

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3 years ago
3x+1+5x=7+15+7x what is x?
LenKa [72]

Answer: x=21

Step-by-step explanation:

To solve for x you must first combine you like terms on each side of the equal sign. So you problem will become 8x+1=22+7x. Then get your x on one side and your numbers on the other by taking the one away from the right side and 1 away from 22. Then take away 7 from the left side to cancel it out. Then take 7x away from 8x to leave you with x. making your answer x=21

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36 is 9 times as many as?
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4 years ago
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If 2 apple and 5 bananas cost 4.20 dollars and 3 apples and 4 bananas coke 4.So dollars what is the price of a apple and banana
e-lub [12.9K]

Answer:

An apple costs $0.45 and a banana costs $0.66.

Step-by-step explanation:

This question is solved by a system of equations.

I am going to say that:

An apple costs x.

A banana costs y.

2 apple and 5 bananas cost 4.20 dollars

This means that:

2x + 5y = 4.2

So

2x = 4.2 - 5y

x = 2.1 - 2.5y

3 apples and 4 bananas cost 4.

This means that:

3x + 4y = 4

Since x = 2.1 - 2.5y

3(2.1 - 2.5y) + 4y = 4

6.3 - 7.5y + 4y = 4

3.5y = 2.3

y = \frac{2.3}{3.5}

y = 0.66

Then:

x = 2.1 - 2.5(0.66) = 0.45

An apple costs $0.45 and a banana costs $0.66.

7 0
3 years ago
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