3. Simplify: 72 +8 [180 + 4 {10 + (15 - 45 - 9 x 2)}] simplify ​

Answer this question! 30 points and brainliest!

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 $s$?

Is a square always, sometimes, or never a parallelogram