Question 16436
  y=3+7x^2  ... this will be a function if there is a definite value of y existing for every value of x under consideration .it is so in this case and hence it is a function.
2. Find g(w) and g(w+1) Problem:  g(x)=3x-5
   given g(x) , to find g(w) , we have to substitute w in place of x in the given function = 3w-5
   similarly by substituting w+1 in place of x we get 
   g(w+1) = 3(w+1)-5 = 3w+3-5 = 3w-2