A Stalk of corn grows from a height of 1 foot to a height of 7 feet in two months. What is its average rate of growth, in feet per month?
I put 3.5 as my answer at school, but my teacher marked it wrong, so please help, thank you!

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers