I have no idea what to do! Zoom in to see clearer! Please don't answer just for points I really need help​

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7

Parabolas y=−2x^2 and y=2x^2+k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.