Physical science Laboratory , physics homework help

Please help me finish these questions.
1 What should be the theoretical acceleration for the ball on the ramp at 2.00o? Answer in proper SI (mks) units. Just enter the number itself, not the units. The theoretical acceleration for the ball should be ___________ (do not enter units with your answer, just the number representing magnitude)
2 Suppose you get a slope of 0.168 for the 2.00o ramp’s linearized distance vs time graph. What is the acceleration of the ball, according to these data? Answer in proper SI (mks) units. The ball’s acceleration has a magnitude of _________ (do not enter units, just the numerical magnitude).
3 What is the percent error for this experiment, based on the results to the previous 3 questions? Your answer does not need to include the percent “%” sign or the plus “+” or minus “-” signs. The absolute value of the percent error is _______ %.
(previous 3 questions:1, 2 and Suppose you get a slope of 0.165 for the 2.00o ramp’s linearized distance vs time graph. What should be the units of this slope? Note, distance is in meters (m) and time is in seconds (s), so your answer should be in the SI (mks) basis. )