What is the percent composition of calcium in calcium oxide (cao) also known as lime or apog? (note: the atomic mass of calcium is 40g and for oxygen is 16 g).

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

After studying french for 5 yearscin school, i was shocked to discover when i went to france that i couldn't even get a glass of water without a lot of sign language what is the author main point