\fSimplify the expression. Assume that all variables are positive when they appear. 340 x31 3 40 O 3- 0'1\"; 0&1ro 02% K Use the Rational Zeros Theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers. x) = 4x3 - 19x2 - 8x + 15 O 1, g, -5; x) = (4x - 3)(x - 1)(x + 5) O -1, 7:, -5; x) = (4x - 3)(x - 5)(x + 1) O -1 3 5; x) = (4x - 3)(x - 5)(x + 1) O -5 3 1; x) = (4x - 3)(x - 1)(x + 5) Initially a patient is prescribed 20 milligrams of a certain medication by a physician to treat high blood pressure. It's determined this medication has a half-life of 3 hours. Use an exponential model ( TL : noertno calculate how many milligrams will remain in the patient in 4.5 hours