Can someone give me a step by step on this problem (surface area and volume)

Surface area would be adding up all the areas for all the sides which would be (16x16)+ (1/2 x16x17)+  (1/2 x16x17)+  (1/2 x16x17)+  (1/2 x16x17)= 800

Area

(16x16) x (15/3)= 1280

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6