Need with a b and c do work for me

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry