Please give me answers

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

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Afarm is to be built in the shape of quadrilateral abcd, as shown below. all four sides are equal. a rhombus abcd is shown with diagonal ac equal to 15.5 feet and diagonal bd equal to 13.2 feet. what is the area of the farm? pleas only pick from the 4 below 62 square feet 52.8 square feet 57.4 square feet 102.3 square feet