It already has "you have to..." so it automatically crosses out the last two and limitation doesn't make sense. This leaves you with simply "limit"
N = # pounds
$1.65 = price per pound
grapes cost

When you multiply cost/pound by the number of pounds, the result is the cost for however much of the grapes Ryan buys.
Therefore,
m = 1.65n
Stout pretty much means strong. When added to the word brave, it's clear that "our hearts" face fear head on, with a strong, unfearing willpower.
Here's an attachment with the answer key to all of your questions.
They are all represented with the same old English language and same settings and time