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Ksenya-84 [330]
2 years ago
11

Please help me and only answer if you are 100% sure it is correct, it affects my grade. I will mark you brainly if you get it ri

ght. NO LINKS.

Mathematics
2 answers:
Greeley [361]2 years ago
8 0

Answer:

Part A: 642

Part B: 45.6

Step-by-step explanation:

Part A

So this circle's area is:

20*20*2.14

= 856

Then subtract the 1/4 remainder.

That is:

856/4

= 214

So the area is 856 - 214

= 642

<u><em>The answer for part A should be 642.</em></u>

|

|

|

Part B

So this circle's perimeter is:

20*2*2.14

= 85.6

Cut the right triangle, that is: 20+20

= 40

So the perimeter is 85.6 - 40

= 45.6

<u><em>The answer for part B should be 45.6</em></u>

Wow, that was my craziest explanation.

I hope this helps, and get a BETTER GRADE THIS TIME! :D

Semmy [17]2 years ago
5 0

Answer:

1256, 125.6 (this is wrong sorry i didn't know that it wasn't a full circle)

Step-by-step explanation:

A) The area that the sprinkler is spraying is in a circle with a radius of 20 ft. The formula to find the area of a circle is pi*r^2, so the area of this circle will be 400pi (substitute 20 for r). Pi in this problem is 3.14, so 400*3.14 is 1256 feet.

B) The perimeter of the spray is technically just the circumference of the circle. The circumference is 2r*pi, so we substitute 20 for r again and we get 40pi. Again, pi is 3.14 in this problem, so 40*3.14 is 125.6 feet.

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Hope this answer is right!!

Step-by-step explanation:

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Simplify.<br><br> 1/4 (1 - 2/3)² + 1/3.<br><br> The answer must be a simplified fraction.
loris [4]

Answer:

\large\boxed{\dfrac{13}{36}}

Step-by-step explanation:

Use PEMDAS:

P Parentheses first

E Exponents (ie Powers and Square Roots, etc.)

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

---------------------------------------------------------------------------

\dfrac{1}{4}\left(1-\dfrac{2}{3}\right)^2+\dfrac{1}{3}=\dfrac{1}{4}\left(\dfrac{3}{3}-\dfrac{2}{3}\right)^2+\dfrac{1}{3}=\dfrac{1}{4}\left(\dfrac{3-2}{3}\right)^2+\dfrac{1}{3}\\\\=\dfrac{1}{4}\left(\dfrac{1}{3}\right)^2+\dfrac{1}{3}=\dfrac{1}{4}\cdot\dfrac{1^2}{3^2}+\dfrac{1}{3}=\dfrac{1}{4}\cdot\dfrac{1}{9}+\dfrac{1}{3}=\dfrac{1}{36}+\dfrac{1}{3}\qquad(*)\\\\\text{the common denominator is}\ 36.\\\\36=3\cdot12\to\dfrac{1}{3}=\dfrac{1\cdot12}{3\cdot12}=\dfrac{12}{36}\\\\(*)\qquad=\dfrac{1}{36}+\dfrac{12}{36}=\dfrac{1+12}{36}=\dfrac{13}{36}

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