Discover Questions

A little help please.
For the formation of aspirin, salicylic acid is acting as an - and acetic anhydride as a -? How many 80 lbs.of concrete do i need for a 12 x 12 x 3 inches deep.? A committee of five is to be formed from 5 boys and 4 girls. How many different committees can be formed with at least 3 boys as members? Find the equation of the plane passing through the points (1,1,2) and (2,4,3) and perpendicular to the plane x-3y+7z+5=0.help me out thanks? A linear expression does not have a squared variable?