They are running 13.1 miles per hour since half of 26.2 is 13.1
For each increment in x, the output is multiplied by 2. The function could be written the way a geometric sequence can be written:
... f(x) = 5·2^(x-1)
Or, it could be simplified to ...
... f(x) = (5/2)·2^x
The first 5 terms will be
... 5, 10, 20, 40, 80
4 papers that are 2 inches by 2 1/2 inches
Answer: attached below
Step-by-step explanation: