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iVinArrow [24]
3 years ago
10

What is the surface area of the cone?

Mathematics
1 answer:
goblinko [34]3 years ago
3 0

Answer: C

Step-by-step explanation:

To find the surface area of a cone, you use the formula A=\pi r(r+\sqrt{h^2+r^2} ). Since we are already given the height and radius, all we have to do is plug in the values and solve.

A=9\pi (9+\sqrt{41^2+9^2} )       [solve inside of square root]

A=9\pi (9+\sqrt{1762} )             [parenthesis]

A=9\pi (50.976 )                   [multiply]

A=458

Therefore, the closest answer is C.

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A circle is cut from a square piece of cloth, as shown: How many square inches of cloth are cut from the square? (π = 3.14)
Vinil7 [7]

Answer:

2122.64 in^2

Step-by-step explanation:

Use the formula for the area of a circle: A=πr^2

The radius will be half the width of the cloth so 52÷2=26

26^2=676

Multiply by π given as 3.14

676×3.14=2122.64 square inches.

The symbol (carat) ^ is used to indicate an exponent when the keyboard doesn't have superscript.

8 0
3 years ago
Lesley has $17 to spend, which she uses to buy a reference book. Write 2 points and solve an equation to show how much Lesley wi
Vikentia [17]

Answer:

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Step-by-step explanation:

6 0
3 years ago
0.5 (2x + 2) = -4<br><br> Solve for x.
Ivanshal [37]

0.5(2x+2)=-4

Multiply by 2 on both sides

2x+2=-8

Subtract 2 on both sides

2x=-10

Divide by 2 on both sides

x=-5

3 0
3 years ago
Read 2 more answers
Select the correct answer.<br> Which graph shows a function and its inverse?
cricket20 [7]

Answer:

Graph B

Step-by-step explanation:

Remember that for a function to have an inverse, the function must be 1-to-1. The two functions must also be symmetrical about the line y=x, which is apparent in the second graph.

7 0
2 years ago
Can the sine or the cosine function ever equal 5? Why or why not?
vlabodo [156]
Sin and cos functions can never be equal to 5. They can never be greater than 1! Both!

You can think of sin and cos functions as projections (that is how i do). Imagine xy coordinate system. Draw a circle which center (center of circle) is in center of xy coordinate system. Let radius of that circle be one (you can take one to be any length you want). 
Now, x - axis and any radius of that circle make an angle. 
NOW HERE IS IMPORTANT PART:
-projection of that radius on x-axis is cosine of the angle that radius and x-axis make.
-projection of that radius on y-axis is sinus of the angle that radius and x-axis make.

From that you can see that projections cannot ever be greater than 1.
8 0
3 years ago
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