She was asking for help from a math or science tutor.
Here's your question:
"kirk grew a crystal in science class. On monday it was 13/16 inch tall. it had grown 1/4 inch bet friday and monday. It had grown 1/2 inch between Tues and Fri. How tall was Kirk'a crystal on Tues?"
Your question is confusing -- it doesn't indicate to WHICH Tuesday you refer.