The expression (t*s)(x) may also be written as t(x)*s(x) which means that the functions are just multiply to each other. From the given, t(x)*s(x) = (4x² - x + 3)(x - 7) Thus, the answer for this item is letter D.
To find your answer you need to do y divided by x. since x = -12 and y = 3 you do 3 ÷ -12 and you get -0.25, this as a fraction is -1/4 and this is your answer! Hope this helped!