9. Find the arc length function for the following curve with the given starting point. y = 7 - 4x/2, P(1,3). A. 1-413/2 dt B. - 10t3/2 dt C. V1+10t3/2 dt D. 1+100t dt E. /1+100t5 dt 10. A tank contains 100 liters of salt water. Pure water is added to the tank at the rate o 20 liters per hour and the well-stirred mixture is drained at the same rate. After 5 hour the tank contains 1 kg of salt. Determine how many kilograms of salt were in the tan originally. A. e-1/20 B. 1/e C. e1/5 D. 1/e5 E. e