Using matlab given x = [3 1 5 7 9 2 6], explain what the following commands "mean" by summarizing
the net result of the command.
a. x(3)
b. x(1: 7)
c. x(1: end)
d. x(1: end-1)
e. x(6: -2: 1)
f. x([1 6 2 1 1])
g. sum(x)

Write a method public static string getdigits(string phonenumber) that takes an 11-character phone number written with any combination of 11 uppercase letters, lowercase letters and/or digits, and zero or more hyphens, and which returns the digits that a person would have to press on a cell phone to dial that phone number. we will use the mapping of letters to digits given at en.wikipedia.org/wiki/telephone_keypad# /media/file: telephone-keypad2.svg you may assume that the string parameter phonenumber contains some combination of exactly 11 uppercase letters, lowercase letters and/or digits, but that any number of hyphens may be present. you can assume that a hyphen will not appear as the first or last character of the string. do not assum