What is the simplified form of each expression?

1.7m^2 + 6.5 - 4n + 2.5m^2 - n

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)

Are you guys willing to me with these last 8 questions on my homework for math reply to this question that i posted

Given a normal distribution with µ=20 and σ = 4, what is the probability that x> 24 x< 24 x< 24 or x> 24