Gabriella is going back to school shopping. Each notebook she buys cost $3 and each pack of markers costs $3. She buys 4 packs of markers and "n" notebooks. She writes the following expression to represent how much she spends: 12+3n Which of the following is another expression she could have written to represent how much she spends?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.