Question 641591
Let x = number of CD's Tiffany has


so if "Ariel has 19 more CDs than her sister Tiffany has", then Ariel has x+19 CDs


and if "Victor has 3 times as many CDs as Ariel has", then Victor has 3(x+19) = 3x+57 CDs


Add them up


x + (x+19) + (3x + 57) = <font color="red">5x + 76</font>


So the answer is <font color="red">D) 5x + 76</font>. So you are 100% correct.