The power supply of a satellite is a radioisotope (radioactive substance). The power output P, in watts (W), decreases at a rate proportional to the amount present; P is given by the equation P=50 e -0.0045t where t is the time, in days. C a) How much power will be available after 335 days? W (Round to one decimal place as needed.) b) What is the half-life of the power supply? days (Round to the nearest integer as needed.) c) The satellite's equipment cannot operate on fewer than 10 watts of power. How long can the satellite stay in operation? days (Round to the nearest integer as needed.) d) How much power did the satellite have to begin with? W (Round to the nearest integer as needed.)