Is the following relation a function?

Yes
or
No

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Solving algebraic equations 2m+3=11

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet