T(n+2)=t -2) + (-1) t(n) + (n+ 1)
+ tín -2) + 2(m - 1)
= 20 +3(
Replace n with n +2 in the recursive formula.
Simplify
Apply the recursive formula and the result from Exercise 1.
Combine like terms.

Let t(n) be the nth term in the Fibonacci Sequence.

Bwould be my guess |-/ 

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answer// dinosaurs emerged during mesozoic era;