Hanai invested $20,000, part at 3% interest and part at 5% interest. the
investment returned $800.

a. what is the system of equations that represents this situation?

b. how was the original $20,000 investment split between the two interest
rates?

c. how would the investment need to be split to make more than $800?
how do you know?

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)