Co-60 has a half life of 5.3 years. If a pellet that has been in storage for 26.5 years contains 14.5g of Co-60, how much of this radioisotope was present when the pellet was put in storage?​

Afireworks display is launched from a platform 10 feet above ground with an initial upward velocity of 70 feet per second. the height of the fireworks above ground after t seconds is given by the equation h = –16t2 + 70t + 10, where h is the height of the fireworks in feet and t is the time in seconds after they are launched. what is the maximum height of the fireworks display, to the nearest foot?