If a line crosses the y-axis at (0, -3) and has a slope of 3, what is the equation of the line? 3x y = 3 3x − y = 3 -3x − y = 3 3x − y = -3

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.)

Me with this one question, and i'll upvote the brainliest answer

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3