Is there law saying I cant be tracer?

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25