Alguien me puede ayudar con este problema !?

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.)

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

The acceleration of an object due to gravity is 32 feet per second squared.what is acceleration due to gravity in inches per second squared?