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

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10