I just need help with two questions

The price of a particular stock is represented by the linear equation , where x represents the number of weeks the stock has been owned and y represents the price of the stock, in dollars. if this relationship continues, what is the price of the stock after it has been owned for 12 weeks? $92.55 $94.37 $100.52 $114.39

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi