15. what is the next number? 2 3 5 7 11 13 17 a.18 b.19 c.20 d.21

The graph below could be the graph of which exponential function?

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.)

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept