Please help with explanation!

Given that the graph at Hi") passes through the point (9, 3) and that the slope of its tangent line at (3: x\" is 33' + 6, what is H3]? [3 A particle moves on a straight line and has acceleration a (t) = 18t + 16. Its position at time t = 0 is s(0) = 15 and its velocity at time t = 0 is v(0) = 1. What is its position at time t = 9