33. Prove that x X (y X z) = (x • Z)y - (x •y)z. (Hint: First prove the result for the case z = i, then for z= j, and then
for z= k. Finally, prove it for an arbitrary vector
z=z1i + z2j + z3k.]

The elmina wilson company produces spaghetti sauce that is used in restaurants. the fixed costs total $1,329,050. the selling price per 64 oz. can of sauce is $12.40. the variable cost per can is $4.80. what is the break-even point in number of cans?