Please help me

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

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap