To find x, you first want to start by adding the 5 to both sides. you should then get 2x=22. then, to get x by itself, divide 2x and 22 by 2. the answer should then be x=11. to check, substitute the x to the 11, and it should look like 2(11)-5=17. 2 times 11 is 22, and if you subtract 5 from 22 you DO get 17, so therefore x is 11.
Angelica would have painted the bedroom in 20 hours if every hour she painted 1/20. But she doesn't paint 1/20 of a room per hour but rather 30 minutes. That means it will take her 10 hours to paint the whole room.
Hope this helps.
Answer: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100
It is 9 because you need to triple 3 so 3x3 is 9