the set of ordered pairs (h, m) where m is the remaining mass of radioactive compound that has been decaying for h hours

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

How do i simply this radical expression?

Graph the following system of linear inequalities. identify at least two points in the solution: y < 5 - 2x | x + 5y > -7