If the vertex of a parabola is (0,-4) what is the axis of symmetry?

Arectangular exercise mat has a perimeter of 36 feet the length of the mat is twich the width writeand solve an equation to determine the length in feet. of the mat then find the area in square feet of the mart

Plz help plz give me the answer

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?