Tommy is looking at a tall building. The building is casting a shadow 48
feet long. Tommy is 6 feet tall and
his shadow is 4 feet. How tall is the
building?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Interpret the following expression (5y^2-7)^3/(2y)^2