I need help plsss just the bottom 3

Select the correct answer from each drop-down menu. a parabola is given by the equation y = x2 − 2x − 3. the directrix of the parabola is given by the equation . the focus of the parabola is .

The length of a basketball court is 84 feet. kareem starts at one end of the court and runs 20 feet forward and then 8 feet back. how many more times will he have to do this until he reaches the end of the basketball court? what equation represents this relationship? !

The row-echelon form of the augmented matrix of a system of equations is given. find the solution of the system.