W1Q1: Create a sequence of numbers

Everyone went for 
y=[2:2:22];
and that is very correct. Also good would have been

y=2:2:22;
or using parentheses
y=(2:2:22);
or, using LINSPACE
y=linspace(2,22,11);


W1Q2: Find a specific entry in a vector

It looked like everyone had it wrong since I misspelled an entry in a
line that I told you not to change. Sad! However, it does tell me that
none of you actually typed the question and answer inside of their own
Matlab command window. You would have quickly seen that

>> v=[1 epx(1) pi 99.9 -4 5 1e6];

Undefined function or variable 'epx'.
and then you could have changed it to not have the misspelling:
v=[1 exp(1) pi 99.9 -4 5 1e6];
And the answer was:
p=v(5);
Also correct was:
p=v(1,5);