MATH 1540 Final Exam (Rev. 2 hrs.) Show all your work. No work no credit. 1. (4 pts) Rationalize the denominator : V2 V2 - V3 2. (4 each) perform the operations and write your answer in standard form. 5 a) (2+31)2 b) 2 - 3i 3. (4 pts) The number of grams A of a certain radioactive substance present at time t is given by the formula A = 36e-0.00254, where t is the number of years from the present. Find the amount remaining after 150 years