The capacity in pounds of the lift used by a roofing company to place roofing shingles and buckets of

roofing nails on rooftops is modeled by the formula shown, where S represents packs of shingles and B

represents buckets of nails. Use the formula to find

**(a)**the largest number of shingle packs that can be

lifted,

**(b)**the largest number of nail buckets that can be lifted, and

**(c)**the largest number of shingle

packs that can be lifted along with three nail buckets.