What is 16+2 and 18-3 and 2*3?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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