It looks right to me.

That is what "annualized" means; it proportions it to equate to a full year.

If you look at lines 32 and 34, yes, it multiplies the 12.4% Social Security tax and 2.9% Medicare tax by 4 to equate the first quarter to the entire year.

As you said, that amount flows to line 15.  But then you need to look at line 20, where it then proportions the tax due down to the payment for that period.