answers:
a. A + B
b. C + D
c. A + D
d. A * B
e. B * D
f. C * D
g. A * A

i choose B since the square root of 25 is 5 and the square root of 16 is 4 so 5+4 is 9
i also chose g as a x a will cancel each other's sqyare root and the answer will be 3
I also chose c x d since u know already they both are rational number either way
i also chose d since it equals to 6