Who was nestor? why is he referred?

Answer. Nestor is actually one of the leaders of the Greeks in the Trojan War which figures prominently in Homer's Iliad. He is absolutely not a character in the novel The Merchant of Venice but he has been referred in the extract because he represents wisdom and good moral judgment.

Hope this helps, have a great day/night, and stay safe!

For the first one:
What you would do is Add each item separately. 
$3.20 for the sandwich *plus* $0.88 for the chips *plus* $0.99 for the drink.
$5.07 would be the price for everything separate.
So which would be the better deal for Anthony?

For the second one: 
you are looking for which number is farther away from 5
You always have to look at 0 first (try drawing your own number line first)
Your answer would be -5.14 because 5 to 11 is closer than 5 to -5.14

Hope ive helped.
Good luck