The cost, in dollars, of parking a car in a busy downtown area for h hours is $10 + $3h. Which statement is correct?
A.
For every hour the car is parked, the cost increases by $10.

B.
For every hour the car is parked, the cost increases by $7.

C.
For every hour the car is parked, the cost increases by $13.

D.
For every hour the car is parked, the cost increases by $3.

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.