I need help with this because i dont know this please send help.

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

Equation for the calculation double 2 and then add 5

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