The width of a rectangle measures (8.4a + 7.5) centimeters, and its length measures (7.4a - 4.4) centimeters. Which expression represents the perimeter, in
centimeters, of the rectangle?
15.9a + 3
O 31.8a + 6

15.8a + 3.1
31.6a + 6.2

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.