Whats the mean in 4, 8, 3, 9, 5

What is the equation of the graph that represents f(x)=x^4 stretched vertically by 2 and shifted up 3 spaces

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?

Which expression is equivalent to the expression for the perimeter of the larger garden?