What is the difference between the weekly pay for the head mechanic and an assistant mechanic, if they both work 40 hour a week. head mechanic $37.52 and assistant mechanic $30.42

I am assuming you mean $37.52 per hour for the mechanic and $30.42 per hour for the assistant.
Simply multiply each of the hourly wages by 40 and compare the results by finding the difference.

Here:
$37.52 x 40 = $1500.80
$30.42 x 40 = $ 1216.80  When you subtract them you get $284 difference.

I’m a smart person so that’s why i think it was 6