Coal gas is produced at a gasworks. Pollutants in the gas are removed by scrubbers, which become less and less efficient as time goes on. The following measurements, made at the start of each month, show the rate at which pollutants are escaping (in tons/month) in the gas: Time (months) 0 1 2 3 4 5 Rate pollutants escape 4 6 2 15 19 (a) Make an overestimate and an underestimate of the total quantity of pollutants that escaped during the first month. An overestimate is tons. An underestimate is i tons. e Textbook and Media (b) Make an overestimate and an underestimate of the total quantity of pollutants that escaped during the six months. An overestimate is tons. An underestimate is i tons. e Textbook and Media (c) How many measurements would have to be made to find overestimates and underestimates which differ by less than 1 ton from the exact quantity of pollutants that escaped during the first six months? Round your answer to the nearest integer. Measurements would have to be made every day(s).v(t) _6 The graph above shows the velocity, in cm/sec, of a particle moving along the X-axis. Compute the particle's change in position, left (negative) or right (positive), between times t = 0 and t = 5 seconds. The total change in position = a cm Ni) 15 _1 12 The graph above shows the velocity, in cm/sec, of a particle moving along the X-axis. Compute the particle's change in position, left (negative) or right (positive), between times t = 0 and t = 15 seconds. The total change in position = n cm