My picture is my question

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

The longer leg of a 30-60-90 trangle is 18