SOORRRY ITS NOT MATHMETICSI don’t know much about this so I really need help thank you!!!

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

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Mr. brettler is hanging up a 5-foot tall rectangular welcome sign in the gym. he has drawn a sketch on a coordinate grid. he has the lower vertices of the sign at (9, –3) and (–6, –3). where would the upper vertices be on the grid?