An equilateral triangle has an apothem measuring 2.16 cm and perimeter of 22.45 cm. what is the area of the triangle, round to the nearest tenth?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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.

What is the correct decimal form of 12%