The answers are A and D.
The numbers that you cannot simplify without having a radical in the answer are irrational numbers.
√(4/16) = 1/4 or -1/4, rational number
√(9/16) = 3/4 or -3/4, rational number
√(9/4) = 3/2 or -3/2, rational number
√(3/16) = √(3)/4, NOT a rational number, cannot remove radical
√(3/4) = √(3)/2, NOT a rational number, cannot remove radical
$18.00 total payment
$15.00 x .05(tax) =$ .75
$15.00 x .15(tip) =$ 2.25
________________________
$ 3.00
+ $15.00
----------------------------------
$18.00
I created this using a graphing calculator website called Desmos! You can use this to further explore slopes and lines and graphing in general :)