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omeli [17]
2 years ago
6

5. On the fifth day of my winter break, I got five golden rings. BUT—— the golden rings were five separate water rings around my

hot tub caused by too high a concentration of iron in the water. The radius of my cylindrical hot tub is 3 feet. How many feet of “golden ring” did I have to scrub off the hot tub? Round to nearest foot.
Mathematics
1 answer:
kvv77 [185]2 years ago
4 0

Answer:

Step-by-step explanation:

1 ring has a radius of 3 feet

1 ring has a circumfrence of 2*pi*r = 2 * 3.14 * 5 = 10*Pi

5 rings would have a length of 50 * pi length = 50*3.14 = 157 feet

That's a lot of Brillo pads.

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Simplify the rational expression.  State any restrictions on the variable.
AveGali [126]

Answer:

The last choice.

Step-by-step explanation:

\dfrac{k^2-k-2}{k^2-4k-5}=\dfrac{(k+1)(k-2)}{(k+1)(k-5)}=\dfrac{k-2}{k-5}

The value of k must be restricted from being one that makes the original denominator zero. Hence k ≠ -1 or 5.

7 0
2 years ago
<img src="https://tex.z-dn.net/?f=5%28sin%28t%29%20%20%5Cfrac%7Bdy%7D%7Bdx%7D%20%2Bycos%28t%29%29%29%3Dcos%28t%29%20%20%28sin%28
Nataliya [291]
Assuming you mean

5\sin t\dfrac{\mathrm dy}{\mathrm dt}+5y\cos t=\cos t\sin^2t

This ODE is linear in y, and you can already contract the left hand side as the derivative of a product:

\dfrac{\mathrm d}{\mathrm dt}\left[5y\sin t\right]=\cos t\sin^2t

Integrating both sides with respect to t yields

5y\sin t=\displaystyle\int\cos t\sin^2t\,\mathrm dt
5y\sin t=\dfrac13\sin^3t+C
y=\dfrac1{15}\sin^2t+C\csc t

Given that y\left(\dfrac\pi2\right)=9, we have

9=\dfrac1{15}\sin^2\dfrac\pi2+C\csc\dfrac\pi2
9=\dfrac1{15}+C
C=\dfrac{134}{15}

so that the particular solution over the interval is

y=\dfrac1{15}\sin^2t+\dfrac{134}{15}\csc t
6 0
3 years ago
The leg of a triangle is 7 cm and the hypotenuse is 13 cm. What is the length of the other leg of the triangle?
defon

Answer:

2√30

Step-by-step explanation:

Pythagorean Theorem: a^2 + b^2 = c^2

7^2 + b^2 = 13^2

b^2 = 120

b = 2√30

6 0
3 years ago
I need this answerd ASAP ill give brainliest to whoever solves it first along with 3<br>40 points​
Gwar [14]

Answer:

Below.

Step-by-step explanation:

Mean = (61+59+60+50+54+56+61+63)/8

= 464/8

= 58 degrees

Deviations:

61 - 58 = 3

59-58 = 1

60-58 = 2

50-58 = -8 = 8   (absolute value)

54-58= -4 = 4

56-58 = -2 = 2

61-58 = 3

63-58 = 6

MAD = (3+1+2+8+4+2+3+6) / 8

= 3.625

= 3.6 to the nearest tenth.

4 0
2 years ago
What are the solutions of x^2+6x=10
posledela

Answer:

x=-3+√19, x=-3-√19

Step-by-step explanation:

x^2+6x=10

x^2+6x-10=10-10

x^2+6x-10=0

a=1 b=6 c=-10 - use the quadratic formula

x=-3+√19, x=-3-√19

I hope this helps!

4 0
3 years ago
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