Jethro has n pigs. Mary Sue has 5 more pigs than Jethro, and Johnny has 3 less than Mary Sue. Which expression represents how many pigs they all have together?

A A. 3n + 2
B. 2n + 7
C. 2n + 2
D. 3n + 7

Mary Sue has n + 5 pigs and Johnny has n + 2. The total is

n + (n+5) + (n+2) = (not what you got)

To find the expression that represents how many pigs they all have together, we need to add up the number of pigs each person has.

Jethro has n pigs.
Mary Sue has 5 more pigs than Jethro, so Mary Sue has n + 5 pigs.
Johnny has 3 less than Mary Sue, so Johnny has (n + 5) - 3 pigs, which simplifies to n + 2 pigs.

Now we can add up the number of pigs they all have together:

Jethro + Mary Sue + Johnny = n + (n + 5) + (n + 2)

After simplifying the expression, we get:

n + n + 5 + n + 2 = 3n + 7

So the expression that represents how many pigs they all have together is:

D. 3n + 7