Question and choices are in the photo please explain the answer

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75