The last sentence uses abbreviations appropriately.
Answer:
Percy feels ashamed and offended that his favorite instructor thinks he's a kooky oddball, or at least that's how he sees the concept of being out of the ordinary. Percy and Grover say their goodbyes to Yancy and board a Greyhound bus back to New York City. Grover is acting strangely on the bus, nervously gazing around him.
Explanation:
read
X(2x)=128
2x^2=128
2x^2/2=128/2
x^2=64
x=8
8/2=4
Half of your number should be 4
Hope this helped