Jerry worked 4 hours on wednesday, 6 hours on thursday, and 9 hours on friday. his gross pay for all three days was $178.60. what was his hourly rate?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?