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likoan [24]
2 years ago
8

Find the surface area of the cylinder. Use 3.14 for pi. Do not round the answer.

Mathematics
2 answers:
USPshnik [31]2 years ago
7 0

Answer:

690.8

Step-by-step explanation:

I've done this one before

melomori [17]2 years ago
6 0

Answer:

690.8 sq units

Step-by-step explanation:

Surface Area(cyl) = 2πrh+2πr²

SA = 2(3.14)(5)(17) + 2(3.14)5²

SA = 6.28(85) + 25(6.28)

= 533.8 + 157

= 690.8

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How many and what type of solutions does the equation have?
Natali [406]
Let's solve the equation 2k^2 = 9 + 3k
First, subtract each side by (9+3k) to get 0 on the right side of the equation
2k^2 = 9 + 3k
2k^2 - (9+3k) = 9+3k - (9+3k)
2k^2 - 9 - 3k = 9 + 3k - 9 - 3k
2k^2 - 3k - 9 = 0

As you see, we got a quadratic equation of general form ax^2 + bx + c, in which a = 2, b= -3, and c = -9.
Δ = b^2 - 4ac
Δ = (-3)^2 - 4 (2)(-9)
Δ<u /> = 9 + 72
Δ<u /> = 81

Δ<u />>0 so the equation got 2 real solutions:
k = (-b + √Δ)/2a = (-(-3) + √<u />81) / 2*2 = (3+9)/4 = 12/4 = 3
AND
k = (-b -√Δ)/2a = (-(-3) - √<u />81)/2*2 = (3-9)/4 = -6/4 = -3/2

So the solutions to 2k^2 = 9+3k are k=3 and k=-3/2

A rational number is either an integer number, or a decimal number that got a definitive number of digits after the decimal point.

3 is an integer number, so it's rational.
-3/2 = -1.5, and -1.5 got a definitive number of digit after the decimal point, so it's rational.

So 2k^2 = 9 + 3k have two rational solutions (Option B).

Hope this Helps! :)
7 0
3 years ago
Read 2 more answers
Please help, solve for x. Due today and all I’ve gotten are links :(
Nookie1986 [14]

Answer:

I think it might be 0 im not to sure.

6 0
2 years ago
Someone explain this?
nadya68 [22]

5\sqrt{96}.
I converted it into decimal form with a calculator and got approximately 48.9898

And if you round that, you will get the 49, which fits the inequality of

45<  5\sqrt{96} < 50 since it becomes 45 < 49 < 50 which is true

8 0
2 years ago
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Two stores sell painting kits. Store 1 charges $12.50 for the painting kit, and customers can buy additional paintbrushes for $0
notka56 [123]

Answer:

14$

Step-by-step explanation:

Please mark brainliest

7 0
2 years ago
The radius of a circle is 20cm. What is its area? ( ratio= 3.14)<br><br> ​
Musya8 [376]

Answer:

A=100π=314.16 cm 2 to 5 significant figures

Step-by-step explanation:

6 0
2 years ago
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