The Purplemath Forums

Hello, why in all precalculus books are only odd numbers to answers ? where is even numbers ? How should i know if the answer is correct ? Thx.

well i'm doing it all on my own, os there is no teacher who would tell me even answers thx for answer.

Anybody can help me with this ? A chemist has four solutions of a very rare and expensive chemical that are 15% acid (cost $120 per ounce), 20% acid (cost $180 per ounce), 35% acid (cost $280 per ounce) and 45% acid (cost $359 per ounce). She requires 200 oz of a 29% acid solution. Find the combinat...

Could someone help me with this ? 75S + 125B\leq 750 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 formul...