What is 3.868x10^9 in standard form

The function g(x) is defined as shown. x-1, -2 g(x) = 2x+3, -1 6-x, x23

Which one ? is the answer and how to find this answer

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in