Chứng minh rằng A/(B/C)=(A/B) hợp ( A giao C)

What expression is equivalent to (2x-1)(x-3)?

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

Pls the last one and it has to be like number 6