First, you find the area of the square. You do 7*7=49, and the area of the square is 49 square centimeters.
Then, you find the area of the triangle. The formula is 1/2*b*h. You know that the base is equal to the side of the square, so it is 7, and it tells you that the height is 3. You do 1/2*7*3=10.5, so the area of the triangle is 10.5.
Since you're trying to find out the area of the entire figure, you add the areas of the square and the triangle. 49+10.5=59.5, so the area of the entire figure is 59.5 square centimeters, or choice C.
Kristen writes 2 pages of notes per hour in class. This is the rate of change. The function can be written as a linear equation y = mx where m = 2 pages per hour.
The function is y = 2x where x is hours in class and y is the number of pages.