Answer ! !
notice that there are two different

Ok so 
surface area=area around+2(area of top)
are of top=circle=pir^2
area around=hiehg times circumference=h2pir or hpid
surfacea rea=2hpir+2pir^2
h=9
r=4
SA=2(9)(3.14)(2)+2(3.14)(2^2)
SA=36(3.14)+8(3.14)
SA=113.04+25.12
SA=138.16
tahat is 1
multiply y 1500 since you want 1500 boxes
138.16 times 1500=207240 in^2

surface area=138.16 in^2
number of square feet of cardboard=207,240 in^2

triangular prism formula=1/3(LWH)
trippleing would be
TPA=1/3(3L3W3H)
TPA=1/3(27LWH)
TPA=27(1/3(LWH))
the result is a volume that is 27 times as large as the original

if both height and base are tripled, then
area of base=1/2(bh)
new is 1/2(3b3h)
1/2(9bh)
9(1/2(bh))
9 times as lage

tripling the other height means the previous one times 3 which is 27

answers are
138.16 in^2
207,240 in^2
9
27