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OMG IM SO SORRY i meant if they can all be odd integers im so sorry for the mistake

Try     (2 + 3i)(5 - 8i)       

15.  15.   15.    16.          16 wins

Formula for the area of a circle:  Area  =  pi·diameter²/4

Old circumference = d   --->   old area  =  pi·d²/4

New circumference = 1.7d   --->   new area  =  pi·(1.7·d)²/4  =  2.89·pi·d²/4

To find the percentage increase, we first need to find the amount of increase:

                    amount of increase  =  new area - old area

                                                     =  2.89·pi·d²/4 - pi·d²/4

                                                     =  1.89·pi·d²/4

Now, we need to divide the amount of increase by the old area:

                  percentage increase  =  ( 1.89·pi·d²/4 ) / ( pi·d²/4 )

                                                     =  1.89

As a percentage:  189%  increase

First, never use an x as a multiplication symbol.

You can use parenthesis or astericks or the multiplication dots instead.

Im assuming here you want this expression more simplified because you gave a ton of information, so

(2ab^3) 5a^3b^2 => 10a^4b^5

Add them up sequentially, then sort them in numerical order and should get 5 sums in a row that are the same. When you do that, this is the result:
(22, 24, 28, 31, 35, 37, 38, 42, 42, 44, 46, 48, 49, 51, 53, 55, 55, 56, 58, 60, 62, 62, 62, 62, 62, 64, 66, 68, 69, 69, 71, 73, 75, 76, 78, 80, 82, 82, 86, 87, 89, 93, 96, 100, 102)
You can easily see that the 5 numbers are sums of 62. Then, there is no guessing: 62 - 15 =47

2^4  3^2  *   3^6   2^3

• 2^7 3^8

AB = 7   --->   c = 7

AC = 2   --->   b = 2

BC = 8   --->   a = 8

Law of Cosines:  a²  =  b² + c² - 2·b·c·cos(A)

                            8²  =  2² + 7² - 2·2·7·cos(A)

                            64  =  4 + 49 - 28·cos(A)

                            64  =  53 - 28·cos(A)

                            11  =  - 28·cos(A)

                      -11/28  =  cos(A)

is there a right triangle such that all 3 sides are integers? Thanks! 

Yes.  3,4,5 is an example.  8,15,17 is another. 

_.

Here are a couple.       3.  4.   5

5.   12.   13

1000(1+.01)^5 - 1000=......

The numbers 49, 29, 9, 40, 22, 15, 53, 33, 13, 47 are grouped in pairs so that the sum of each pair is the same. Which number is paired with 15? 

The highest number in the list is 53 so all the totals will have to be larger than 53.  I knew it couldn't be a large number paired up with another large number or the other pairs couldn't be that much, so I tried the smallest number, 9.  The total is 62.  So I tried pairing up others to total 62.  That seemed to work okay, and the one that pairs with 15 is 47. 

_.

a) was right thank uu so much. But it said that the answer for b) was wrong

Thank u for helping out 

Let's multiply both the numerator and the denominator by 5^1/16 - 1:

The numerator becomes:  4·(5^1/16 - 1)

The denominator becomes:  (5^1/2 + 1)(5^1/4 + 1)(5^1/8 + 1)·[ (5^1/16 + 1)(5^1/16 -  1) ]

                                    =        (5^1/2 + 1)(5^1/4 + 1)(5^1/8 + 1)·[ (5^1/8 -  1) ]

re-group:                     =        (5^1/2 + 1)(5^1/4 + 1)·[ (5^1/8 + 1)(5^1/8 -  1) ]

                                    =        (5^1/2 + 1)(5^1/4 + 1)·[ (5^1/4 - 1) ]

re-group:                     =         (5^1/2 + 1)·[ (5^1/4 + 1)(5^1/4 - 1) ]

                                   =          (5^1/2 + 1)·[ (5^1/2 - 1) ]

                                    =         5 - 1

                                    =         4

Fraction:  4·(5^1/16 - 1) / 4  =  5^1/16 - 1

[ ( 5^1/16 - 1 ) + 1 ]⁴⁸  =  [ 5^1/16 ]⁴⁸  =  5³  =  125

OOF I forgot to subtract by 1000, so i got it wrong. Dang it. Thanks for your help tho!

The hint!

If I'm not mistaken, this could be the answer to your 1st question. ( The other two are similar.) 

https://www.youtube.com/watch?v=XF6ANdzZDgA

\(x= \text{any number between -3 and -5.000...02 exclusively }\)because -2.00...01 is the biggest and -4.99999 is the smallest number since when they add 7 they are a number between 2 and 5 so it because any one of the numbers like -2.999... and -5.00...01... would add up to 2.00...01 and 4.999...