If the distance of an object from earth is increased by a distance x, by what factor has its apparent brightness changed?

Question 5 spring semester final exam math evaluate

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points