(a) Four numbers have a mean of 9 and a median of 6. The four numbers are 2,
5, a, b. Find the value of a and b.

Liam's parents are driving three times as fast as liam is biking, but they left later than he did. if his parents caught up with him two hours after he left, how much later than liam did they leave?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?