Quantity surveying construction 333

A 20 X 12 building with a 4 in 12 pitch has plywood siding.

a) How many sheets of plywood is needed to cover roof with 2' 0" overhang?

b) how many studs are needed for the perimeter walls if the studs are 16" o.c? c) calculate for corners with 3 each extra

B

a) How many cubic yards of topsoil will one excavate from the building site in A (-above) with a topsoil depth of 1' 0"?

b) How many acres are in the site in question A?

if  you answer me part A i would know that you can do it, ive part of the answer and i need it in 24hrs 

if your woek good then ill keep you for the REST of the SEMESTER

ill offer $5 for this