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4 years ago

A helicopter's rotor sweeps out an area of 121 pi square

Mathematics

1 answer:

Nuetrik [128]4 years ago

6 0

Answer:

<h2>22 meters.</h2>

Step-by-step explanation:

It's important to notice that the area is circular, which is defined by

$A= \pi r^{2}$

Replacing given values and solving for r, we have

$121 \pi = \ pi r^{2} \\121=r^{2}\\ r= \sqrt{121}=11$

But, the diameter is twice the radius, so

$d=2r=2(11)=22$

Therefore, the diameter is 22 meters.

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If you multiply 12 subtract 2.40 how do you get 9.60 because I got 2.80

posledela

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3 years ago

This is a parallelogram. Using it's properties, what is the measure of: x = y =

Serggg [28]

Answer:

x = 10

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Step-by-step explanation:

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3 years ago

For each function, y varies directly with x. Find each constant of variation. Then find the value of y when x=-0.3

Viktor [21]

Answer:

1- The constant of variation is $\frac{10}{3}$

2- The constant of variation is $\frac{4}{3}$

Explanation:

When two variables are in direct variation, this means that when one of them increases, the other increases and vice versa

A direct variation relation is represented as follows:

y = kx

where k is the constant of variation

Now, to get the constant of variation, all we have to do is substitute with the given x and y variables and solve for k

For the given problems:

1- $y = \frac{2}{3}\ when\ x=0.2$ 

Therefore:

$y = kx\\\\\frac{2}{3} = 0.2k\\\\ k = \frac{10}{3}$

2- $y = 4\ when\ x=3$ 

Therefore:

$y = kx\\ 4 = 3k\\ k = \frac{4}{3}$

Hope this helps :)

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3 years ago

Work out 1 7/12 + 13/20 in its lowest terms

saul85 [17]

Step-by-step explanation:

$= 1 \frac{7}{12} + \frac{13}{20} \\$

$= \frac{1 \times 12 + 7}{12} + \frac{13}{20} \\$

$= \frac{19}{12} + \frac{13}{20} \\$

$= \frac{19}{12} \times \frac{5}{5} + \frac{13}{20} \times \frac{3}{3} \\$

$= \frac{95}{60} + \frac{39}{60} \\$

$= \frac{90 + 39}{60} \\$

$= \frac{129}{60} \\$

$= \frac{43}{20} \\$

$= 2 \frac{3}{20} \\$

...

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2 years ago

What is 123,455×123.32÷10

kogti [31]

the answer is 1,522,447.06

hope I helped:)

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3 years ago

Read 2 more answers