How can i simplify this and show work?

The graph shown is the graph of which function?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in