Which graph best represents a function with the rage of all real numbers greater than or equal to -6

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a