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Name________________________________ Block ___________ Date 2-7-12 Warm up-- Write the ordered pair for each point shown and circle the Quadrant number that it is in. A. ________ 1 2 3 4 B __________1 2 3 4 C __________1 2 3 4 D ________ 1 2 3 4 E __________ 1 2 3 4 F __________ 1 2 3 4 G. ________ 1 2 3 4 H __________ 1 2 3 4 I __________ 1 2 3 4 Practice A. Relation – is a set of ordered pairs—write the relation as a table, graph and mapping: Ordered pairs table Graphing {(1, 1), (0, 2), (3, -2)} *set brackets mapping x *each x and y listed next to each other ea ordered pair plotted as a pt y each x and y written only one time and connect with line Domain _______________________________________________________________________________ Range _______________________________________________________________________________ Growth formula _____________________________ Decay Formula________________________________ Used when a quantity is increased by a percent Used when a quantity is decreased by a percent A is the ending amount, C is starting amount, r is the rate of increase or decrease as a decimal(divide % by 100) Practice B – Use the growth or decay formula to find the new amounts 1. The average rent in Mecklenburg county in 2011 was $858. The next year it was expected to go up by 10.5%. What would the new average rent be? 2. Mr. Bates income for last year was $45,000. This year his income was $47,500. By what percent did it increase? 3. Patriot and Giant jerseys normally sell for $80. It is projected that after the super bowl the winning team’s jersey will sell for 20% more and the losing team will sell for 20% less. What will the new prices be? 4. Albert started his diet and weighed 200 pounds. Three months later he weighs 180 pounds. By what percent did his weight go down? Practice C – Write the equation and then solve 1. Alex can run 3 mile in 22 minutes, assuming he can maintain this speed, how are could he run in 36 minutes? Round to the nearest tenth. 2. Alex and 3 of his friends all go to Carowinds. It costs $15 to park and they each need to buy a ticket. If the total cost was $158.96, how much does each ticket cost? Equation: Equation: 3. Josh’s paycheck is $345 when he works 40 hours, how much could he expect to earn if he only worked 30? 4. Josh and his girl friend went to the beach and rented a bicycle built for 2, for the day. The charged him $7.50 per hour. If the bill was $26.25, how many hours did they ride? Equation: Equation: Practice D – Simplify: 1. -3(4x – 2) + 3x 2. 32 g 64 8 Practice E – Solve: 1. 3x – 4 < 2 or x + 2 8 4. 8(h + 3) = 7(h – 3) 14. k 2 3 4 2(5a + 6) = -(3a + 8) 8. –8x – (3x + 6) = 4 – x 11. – 3 = – 23 + 4x 15. x 3 4 2 5 4. 5(x – 4y) – 3(x – 2y)+ 2y 3. f + 8 1 or 20 > 3x – 4 > 2 5. 7. 3w – 6 – 2w = –6 + w 10. 5x – 4 = 16 2. 3. x – 5(-4x – 7) 6. 2h2 2 5 –4(2f – 4) = –2(–f + 2) 9. 4(6m + 4) = 8(3m + 8) 12. -6y – 3 = 27 16. f + 9 > -4 13. 33 = 5 – 7z 17. 3 x 3 4 2 6