Determine which product has the lower unit price: a 5-pound bag of sugar for $1.86 or a 12-pound bag of sugar for $4.45?

How do you solve a question like this?

Give the functions f(x) = |x + 2| - 3, what is the domain? a,b,c, or d all real numbers x > 2 x < -2 all real numbers and x cannot equal to 2

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x