Irwin rode his bicycle from one end of a trail to another and back at a speed of 20 miles per hour. if the trail is 4 miles long, for how many hours was irwin riding?
a.0.2 hours
b.0.4 hours
c.2.5 hours
d.5.0 hours

Pls super important solve the botton one

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?