Find the missing length. Round to the nearest tenth.
HELP PLEASE!!

7.6

Use the Pythagorean theorem

3^2 + 7^2 = c^2

9 + 49 = 58

square root of 58 =

7.615

The word BALLOON has 7 characters, but only 5 letters (2 of them are repeated, L and O). The 5 letters used in the word are: B,A, L,O and N. In order to find the number of possible ways in which the letters can be arranged we need to note that:- there are 5 letters- two of them are used two times .To arrange 5 letters there are 5!=5*4*3*2*1=72 possibilities.To arrange the two O and A there are: 2!*2!=2*1*2*1=4So, there are 72/4=18 possible ways to arrange the letters in the word balloon.