Please help! Geometry: Translations

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

What is (28 + 7 + 6 + 3) x 1/2 show your work