Which regular polygon can create complete completely tessellate a plane

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Find the distance between the point (-3,-4), and (see the picture below)

What is perpendicular to y=-1/2x+11