9. The terminal rays ofthe angles I'I and are shown below. ,3 Find the exact value of cos {a + m 10. A colony of bacteria has a mass of 4.5 grams when initially observed and grows at a rate of 3% every six hours. a] What is the mass of the colony after 24 hours? b) How long will it take the colony to reach a mass of 30 grams? 11. Solve the inequality 12 31' 2 S I + 10 a] Algebraically b)Graphically 10 u. n. i: u u- .10 12. Solve the equation 5 1 _ 1 xZ 1+3_xz+x6