please answer these and show step by step process( explaining with words too)

homework2.math.pitt.edu/res/pitt/athanas/avgvelocity-1.problem?symb=uploaded%2fpitt%2f16145597ace286173pittma Jason Achampong . (Student - section: 15270) 2221_15270 MATH 0220 ANALYTC GEOMETRY & CALCU Main Menu Contents Grades Course Contents > ... > PROBLEM SET 3 > avgvelocity-1 The position (in meters) of a particle moving along a straight line is given by s ( t ) = 1t -5 t + 6, where t is measured in seconds What is the average velocity on each of the given unit time intervals? [1, 2 ] [2, 3 ] Submit Answer Incorrect. Tries 2/8 Previous Tries What is the average velocity on each of the given half-unit time intervals? [1.5, 2 ] [2, 2.5 ] Submit Answer Tries 0/8 What is the instantaneous velocity at time t = 2 7 5 Submit Answer Incorrect. Tries 3/8 Previous Tries Determine the equation of the tangent line to the curve s ( t ) = 1 to -5 t + 6 at the point ( 2, s(2) ). (The domain variable in this problems is t. ) y = Submit Answer Tries 0/8 Post Discussion