Part 1: Evaluate a Summation (10 points) Complete the function calculate, which computes and returns the value of the following sum for the given arguments, x and n. n? na n2 2x' + n + (2x2 + +...+2x" + i 1 2 Examples: Function Call Return Value 2272.2 calculate(3, 6) calculate(-2, 4) calculate(7, 2) 53.3333 118.0 [] 1 def calculate(x, n): 2 pass # delete this line and start writing your code here