If you have 7x^2 + 3 if the input is 4 what is the output

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.)

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which shows the graph of the solution set of 3y – 2x > –18?