On a recent trip, Juan started at an elevation of 1200 feet above sea level. He descended into a valley 20.4 feet below sea level. Which of the following shows one way to calculate how many feet he descended in all? A. -20.4 – (-1200)
B. 1200 – 20.4
C. -20.4 + 1600
D. 1200 – (-20.4)

hello :

by applying the distributive property :

6 × 4.3 = 6 × ( 4 + 0.3 )

            =   (6 ×   4) + (6 ×   0.3)

            = 24 + 1.8

6 × 4.3 = 25.8

care to share were the trapezoid shown is ?

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.