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If the exterior angle is 30, the interior angle is supplementary to this = 150 

And we have

(n -  2)(180) / n = 150

(n - 2)(180) = 150n

180n - 360  = 150n   rearrange

30n = 360      divide by 30 on both sides

n = 12 sides  {a dodecagon}

it is 7536 

Let the width  = W

Then the length is 2W

And L x W x H  = Volume

So we have

2W x W x 3 = 420    simplify

6W^2  = 420        divide both sides by 6

W^2  = 70            take the square root of both sides

W = √70 ft = about 8.4 ft

you would have to turn the denominators into the same number and multiply by the same number so it would be 9/48 + 40/48 and that would be 49/48 which is actually 1 and 1/48

Note that the y values are the same.....this indicates a horizontal line....

The mean is given by the sum of the values / the number of values  ......so we have...

[25 + 10 + 40 ] /  3  =

75 / 3  =

25

cos 72  = 15 / x       multiply both sides by x and divide both sides by cos 72.....this gives

x = 15 / cos 72  =  about 48.54

the answer is 17 because it is

2/x + 9 = 16     subtract 9 from both sides

2/ x = 7            multiply both sides by x

2 = 7x              divide each side by 7

2 / 7 = x

Assuming a normal year of 365 days, just compute

130,490 / 365

-9 - - 4

Remember that two negatives multiplied together produce a positive.....so we have....

-9 + 4  =

-5

It is -13. The other, incorrect, answer is -5 but remember; The value of a number must go down if you takes something away from it. -13 is less than -5 or -9. 

The sum of the first n odd numbers = n^2

And the number of odd terms is given by [1 + n] / 2

So we have

[1 + 3983] / 2 = 1992 terms

So 

1992^2 / 1992 =

1992

27/2 is the lowest fraction it could be, it is an improper fraction. It could also be 54/4 or 81/6. These all have a value of 13.5... try it on a claculator

On my calculator i have to press second function and then sin and it pops up as inverse sin etc.

22 over 3 is a fraction and you can't simplify it because 3 is a prime number dude.

i believe we have

sin^(2)x + 5 sinx - 3= 0      we could make a substitution and use the quadratic formula, but I prefer a graphical approach

4/5x=16

->x=16/4/5

x=20

The price per bag =

9.00 / 20 = 

.45  =  45 cents

z^(1/2)  = 40

Square both sides

z = 1600

There are 12 times 30 degrees  = 360 degrees in a circle

So 5 people represent 1/12 of the total.

So 12 times 5 = 60 people in total