Suppose Lakeside Marina charges a $35 rental fee for a boat in addition to charging $15 per hour. The linear function is modeled by f(x)=15x + 35, where f(x) represents the total cost of renting the boat, and x represents the number of hours the boat was rented. What is the cost of renting the boat for 3 hours? A.

$80

B.

$10

C.

$10

D.

$50

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.