"0.32 with a line above it" could refer to two possible numbers, either

or

.
In either case, 0.32 will be the smaller of the two numbers simply because it terminates with two digits after the decimal point, while the others keep going, basically adding a small positive number to 0.32.
It would be -8d + 3w because
-(8d -3w)
you would be multiplying the hole equation by -1
so 8d would become -8d
and -3w would become positive +3w meaning the answer is -8d +3w
Answer:
$10.10
Step-by-step explanation:
$7.50 + $2.60 = $10.10