Find the half-life of an element which decays by 3.401% each day?

What is the equation in point slope form of the line that passes through the point (-1, -3) and has a slope of 4? y-1=4(x-3) or y+3=4(x+1)

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

Ihonestly have no clue if it's each or none.