Is the function linear or nonlinear?

x −2 0 1 3 4
y 4 8 10 14 16

a. linear

b. nonlinear

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 $s$?

Which number line correctly shows 0.8 + 0.3?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.