Evaluate this piecewise function at x=-8 and x=4

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?