i dont get how to solve these

You are a risk manager for an investment bank which trades options on XYZ stock. You have a stock options position of several thousand options and the net delta is currently zero to start the day. You decide that the way you want to dynamically hedge the delta is by re-hedging it only at the one day expected move in the underlying stock. Using the expected move formula, what is the expected one day move of XYZ stock if the price is $45 and the volatility is 36% (choose the best answer below)? a. +1.64 b. +/$1.02 c. +136% d. +1.06 e. none of the above 2. You are a Chief Financial Officer for a company which is long several one year crude oil options to hedge some of the firm's operational risk. You decided that you want to re-hedge the delta of the position once a quarter (i.e. every 90 days) if it reaches the expected 90 day move. Using the expected move formula, what is the expected 90 day move in crude oil if the price is $55 and the volatility is 25% (choose the best answer below)? a. +/$9.68 b. +/$8.22 c. +/$4.91 d. +/$5.21 e. none of the above