Can somebody explain factors and divisibility. Like some examples and explain it in a easy way thanks! Cuz I don’t get it. (Only if u done this before)

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

Rationalize the denominator- 12x/√x-10