27% of the bowling balls were too heavy for Fred. If Fred had 511 to choose from, how many bowling balls were there in total?

Which system of linear inequalities is represented by the graph?

The gdp is $1,465.2 billion. the population is 249,793,675. find the per capita gdp.

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.