Return the number of days in a given month in 2017. If the input is not a valid month number, return -1.
Input: m = 1
Outpu: d = 31
Input: m = 2
Output: d = 28
Input: m = 13
Output: d = -1
You cannot use IF statements
Doubling elements in a vector
Television Screen Dimensions
Replace multiples of 5 with NaN
Times 3 problem
Capitilize the first letter of every word in a string
Separate even from odd numbers in a vector - with a loop
Find the average of a random sequance
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