1. A toy company makes a doll that sells for $12.00. It
costs $5.00 in labor costs to make each doll. The cost
for materials is $420. How many dolls must they sell
to break even?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)