A$140 car stereo is marked up 50% and then discounted 50% will the final price of the car stereo be #140

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

Need on this one asap im almost done with this subject

Select the quadratic that has root x = 8 and x = -5