What is the domain and range

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.)

For what value of x does 4x = (1/8) x + 5?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?