HELP!! I have been stuck on these questions forever! Im having to add and subtract in scientific notation. Im having to find the sum or difference. I will mark brainiest.

Me because some of question i don’t understand

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6

Which of the following is a cost homeowners insurance does not protect? a. the cost of repair or replacement of a home lost in a natural disaster. b. additional living expenses required while your home is repaired after a disaster. c. replacement costs for all contents in your home, including high cost electronics. d. the cost of medical expenses incurred by somebody getting injured on your property. select the best answer from the choices provided