I need help with Economics :/

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

The price of a visit to the dentist is \$50$50. if the dentist fills any cavities, an additional charge of \$100$100 per cavity gets added to the bill. if the dentist finds nn cavities, what will the cost of the visit be?