200,000 = 158,000(1.06)^x Divide both sides by 158,000 1.2658 = 1.06^x Take the log of both sides and use the power rule to bring down the exponent (x) to the front. log 1.2658 = x log 1.06 Divide both sides by log 1.06 log (1.2658)/log(1.06) = x x = 4 years
We can see from this survey that 7 teenagers prefer rock and roll. The number of all teenagers in the survey is: 12 + 5 + 7 + 6 + 6 + 4 = 40 P ( rock ) = 7 / 40 Answer: C ) 7 / 40
