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3 years ago

What did I do wrong when finding out the sector area? I know the answer I got is wrong so can someone please help me

Mathematics

1 answer:

Romashka-Z-Leto [24]3 years ago

7 0

A circular sector is the area between two radii of a circle and the arc between them.

The area is indeed given by

pi*r^2*(arc angle/360)

=pi*10.5^2(118/360)

=36.1375 pi cm^2

=113.529... cm^2

Therefore your answer is correct, to the first decimal place.

Perhaps you can check if the question specifies a different accuracy for the answer, or a different value of pi to be used.

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out of 30 questions on the maths test tomi knew the answer to 27 of them what percentage of questions did tomi know the answer f

Vedmedyk [2.9K]

Answer:

Step-by-step explanation:

$\frac{27}{30} \times 100$

so after we cut the nessecary we get 90%

Hope this helps you

Mark as the brainlist

thank you

8 0

3 years ago

-17xy + 5x - (-25xy) - 5x

poizon [28]

$-17xy+5x-(-25xy)-5x=-17xy+5x+25xy-5x\\\\\text{combine like terms}\\\\=(-17xy+25xy)+(5x-5x)=8xy$

3 0

3 years ago

Help me :)<br> I need help <br> Algebra 2

Dmitrij [34]

What is the question?

8 0

3 years ago

Researchers have found that after 25 years of age the average size of the pupil in a

laila [671]

Answer:

At 25 = 6.8612mm

At 50 years = 5.422mm

Step-by-step explanation:

Equation,

d = 2.115Logₑa + 13.669

d = diameter of the pupil

a = number of years

Note : Logₑa = In a (check logarithmic rule)

d = 2.115Ina + 13.669

1. At 25 years,

d = -2.115In25 + 13.669

d = -2.115 × 3.2188 + 13.669

d = -6.807762 + 13.669

d = 6.8612mm

At 25 years, the pupil shrinks by 6.86mm

2. At 50 years,

d = -2.1158In50 + 13.669

d = -2.1158 * 3.912 + 13.669

d = -8.2770 + 13.699

d = 5.422mm

At 50 years, the pupil shirks by 5.422mm

To save this question, I had to plug in the values into the equation.

Solving for Logₑa might be difficult, so instead I used Inx which is the same thing. Afterwards, i substituted in the values and solve the equation for each years.

8 0

3 years ago

Can anybody help me please

Mumz [18]

(_ , _) means (X , Y)

(25 , ) means

X = 25 then you need find the value of Y from the equation .

$y = \frac{1}{5} x - 8 \\ y = (\frac{1}{5} \times 25) - 8 \\ y = 5 - 8 = - 3$

so the first answer is (25,-3)

..............

( , -8) means

Y = -8 then you need to find the value of X from the equation .

$y = \frac{1}{5} x - 8 \\ - 8 = \frac{1}{5} x - 8 \\ 0 = \frac{1}{5} x \\ x = 0$

so the second answer is ( 0 , -8 )

hope this would help you

3 0

3 years ago