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A ladder leans against a house at a point 19 feet high. The ladder is 25 feet long. What is the measure of the angle formed by the ladder against the house?

How do I solve the following: 500ml .4M aluminum nitrate solution contains ______moles of aluminum ions and _______moles of nitrate ions. I am helping my fiance and we don't know how to calculate this.

Luke can purchase a 10-pound item from several different stores. Which of the following is the best buy?

Luke can purchase a 10-pound item from several different stores. Which of the following is the best buy? A Buy online for $15 plus pay shipping costs of $1 per pound. B Buy online for $17 plus pay shipping costs of $0.50 per pound. C Buy at a local store...

Global warming