How many zeroes are in the simplified expression 4 times 10x

If myesha works overtime, she gets paid "time and a half" for every hour she works. in other words, for every hour over 40 hours myesha works each week, she gets her hourly pay plus half her hourly pay. what is myesha's pay per hour when she works overtime?

Average acceleration: i have no idea how to do this.

How to do this , and can some one explain