X^2-5x>14 justification

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Twelve less than a number is at most 20

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle. he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field