Which expression is equivalent to -9x^-1 y^-9/-15x^5 y^-3 Assume x≠0 y≠0

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Television viewing reached a new high when the global information and measurement company reported a mean daily viewing time of 8.35 hours per household. use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household. a. what is the probability that a household views television between 4 and 10 hours a day? (to 4 decimals) b. how many hours of television viewing must a household have in order to be in the top 7% of all television viewing household? (to 2 decimals) c. what is the probability that a household views television more than 4 hours a day? (to 4 decimals)

When adding 43.8 to a certain number, the sum is 46.59, as seen below. what number should go in the box to complete the addition problem? the decimal 43.8 is added to an unknown whole number and 79 hundredths to equal 46.59. numerical answers expected! answer for blank 1: