35,000,000 what is the order of magnitude of this number

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 $s$?

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

Determine domain and range, largest open interval, and intervals which function is continuous.