Last week colby baby-sat for 12 hours and earned $156. he earned the same amount of money for each hour he baby-sat. how much money, in dollars, did colby earn per hour for baby-sitting? enter the numerical amount only. do not put the dollar sign.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list