16 the solid in the diagram has a surface area of 18 units2. if a cube is added on the green face, what will the new surface area be? a) 20 units2 b) 21 units2 c) 22 units2 d) 23 units2

The complete question in the attached figure

Let 
x------> length side of a cube

we have that
[surface area original]=18 units²

surface area original=x²*[number of faces]
number of faces=2*[4+4+1]-----> 18 faces

surface area original=x²*[18]
18=18*x²-------> x²=18/18---------> x=1 unit

If a cube is added on the green face,the new surface area will be
18+4*[area of one faces]-----> 18+4*1²----> 22 units²

the answer is
22 units²

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.