Don't understand this question

Someone help me.

Which expression gives the area of the triangle shown below

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?