Help me wit this logic problem What's the number?

It says factor each expression 49x-28?

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)

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily