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Olenka [21]
3 years ago
15

N and (2 + 6) What is the answer

Mathematics
1 answer:
AleksandrR [38]3 years ago
3 0

Answer:

8n

Step-by-step explanation:

distribute n between 2 and 6 then add

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Helppppppppppppp. a and b partttt​
PilotLPTM [1.2K]

Answer:

a) 220.17 cm

b) 2127.12 cm²

Step-by-step explanation:

perimeter = circumference

it is the sum of the inner and the outer arc and the 2 side lines of 25.

we know a full circle has 360 degrees. but we only look at a segment of a circle of 150 out of the total of 360 degrees.

the circumference of a circle is

C = 2×pi×r

the 150 degree part is then

C = 2×pi×r×150/360 = 2×pi×r×15/36 = pi×r×15/18 =

= pi×r×5/6

the radius of the inner circle is 20.

=>

Ci = pi×20×5/6 = pi×50/3

the radius of the outer circle is 20 + 25 = 45

Co = pi×45×5/6 = pi×75/2

so, the total perimeter/ circumference is

C = Ci + Co + 25 + 25 = pi×50/3 + pi×75/2 + 50

= pi×100/6 + pi×225/6 + 50 = pi×325/6 + 50 =

= 220.17 cm

the area of the shaded shape is the area of the large circle segment minus the area of the small circle segment.

the area of a circle is

A = pi×r²

the 150 degree part is then

A = pi×r²×150/360 = pi×r²×5/12

so, for the inner circle that is

Ai = pi×20²×5/12 = pi×400×5/12 = pi×100×5/3 = pi×500/3

for the outer circle that is

Ao = pi×45²×5/12 = pi×2025×5/12 = pi×10125/12 =

= pi×3375/4

so, the total area of the shaded shape is

A = Ao - Ai = pi×3375/4 - pi×500/3 = pi×(10125-2000)/12 =

= pi×8125/12 = 2127.12 cm²

4 0
2 years ago
Pleaseeee helpppp<br> Please
agasfer [191]

Answer:

∠ACD= ∠BAC ( reason: CPCTC)

4 0
3 years ago
Find the average of$ 1148.37,$1760.44,$1143.57,and 1336.17 then round to the nearest cent
schepotkina [342]
If you total them it equals $5388.55. and then divide by 4 and the average is 1347.1375 and the you round to nearest cent. $1347.14
3 0
3 years ago
I am needing to know the answer to 3/7 of what number is 9?
kolezko [41]
In math, "of" almost always means "times".

So your question is:  3/7 times (the number) = 9

Multiply each side of that equation by  7 :   3 times (the number) = 63

Divide each side by 3 :             <em> The number = 21</em>
3 0
3 years ago
Read 2 more answers
Write a number that is greater than 8.604 but less than 8.643
Aliun [14]
8.605
This number is bigger than 6.604 and it is smaller than 8.643
:)
6 0
3 years ago
Read 2 more answers
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