What is the domain and rangeee please im taking a test rn

Which is an equation for the nth terms of the sequence 12,15,18,21

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

() at a farm, animals are fed bales of hay and buckets of gain. each bale of hay is in the shape of a rectangular prism. the base side lengths 2 feet and 3 feet, and the height is 5 feet. each bucket of grain is a cylinder with diameter of 3 feet. the height of the bucket is 5 feet as the height of bale. a. which is larger in area, the rectangular base of the bale or the circular base of the bucket? explain how you know b. which is larger in volume, the bale or the bucket? explain how you know