8. When the roller coaster car rolls down to a height of 4 meters, what is its velocity? Show your work! Hint: the total energy of the car does not change and is known from the previous problem.

Examine this system of equations. what integer should the second equation be multiplied by so that when the two equations are added together, the x term is eliminated? 3/4x+1/7y=6 1/8x-3/5y=16

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.