CAN SOMEONE HELP ME PLEASE !!

(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

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Find the zeros of each function. f(x) = 6x^2 - 7x - 20