Solve a(x − b) − 2k = l for k. a. k = −fraction one half [l − a(x − b)] b. k = fraction one half [l − a(x − b)] c. k = −2l − ax − ab d. k = −2l + ax − ab

Nielsen media research wants to estimate the mean amount of time (in minutes) that full- time college students spend watching television each weekday. find the sample size necessary to estimate the mean with a 15-minute margin of error. assume that a 95% confidence level is desired. also assume that the population standard deviation is known to be 112.2 minutes.