Unit 3B Review Sheet - Cobb Learning

CC Coordinate Algebra Unit 3b Test Review – Day 4216. Which equation represents exponential decay?1a. y x 21b. y x2c.1y 21y 52d. xx17. After a single sheet of paper is folded in half, there are two layers of paper. If the same sheet if folded asecond time, there are four layers of paper. Which equation represents the number of layers of paper, y,after the original sheet of paper is folded a total of x times?2a. yxb. y2xc. y 2 xd. y 4 x18. In the equation y 4 x , by what percent does y increase when x increases by 1 unita. 100b. 200c. 300d. 40019. Which equation models the data in the accompanying table?x 0 1 2 3 4 5 6y 5 10 20 40 80 160 320a. y2x5b. y 2 xc.y5x2d. y 52 x20. The height, h, of a bouncing ball after x bounces is represented by the equation h 800.5x. How manytimes higher is the first bounce than the fourth bounce?a. 8b. 2c. 16d. 421. The current population of Little Pond, NY, is 20,000. The population is decreasing, as represented by theequation .25PA 1.3t, where P = final population, t = time in years, and A = initial population.Estimate to the nearest hundred people the population of Little Pond 10 years from now.