1. a bedroom is 10ft. by 11ft. what is the perimeter? = 21ft. is this correct?

Question

2. Find the prime factorization of the number 40 = 2X2X2X5= 40 is this correct?
3. perform the indicated operatio. 6 2/9 + 1 3/4 - 3 5/6 = 4 5/36 is this correct?

Answer 1

Numbers 2 and 3 are right.

For the first question, the bedroom has four walls --
(2 * 10) + (2 * 11) = 20 + 22 = ?

Answer 2

I dont think one is right. if theres 4 walls in a room do 10+10+11+11=?