Hello tutor, kindly assist by answering these questions. Thank you

The population of a herd of cattle over time (in years) is given by p(t) = 160 (9 + 0.1:: + 0.04%) .What We growth rate (in cattle per year) when t = 7 years? Tries 0/99 What is the rate of change of the area of a circle with respect to its radius when r = 4.5? Keep your answer exact. Tries 0/99 The position of a particle moving in a straight line is given by s(t -28t2 + 140t - 18 (a) At what time is the velocity zero? Round each answer to two decimal places. t = Submit Answer Tries 0/99 (b) What is the position of the particle at this moment? Round each answer to two decimal places. S = Submit Answer Tries 0/99