9/4 - 7/10 i cant figure this out

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?