Question

( (0.1095 mmol/mL)(25 mL) - (0.1482 mmol/mL)(29.04 mL) ) / ( (1000 mg/g)(1.3010 g) )

what is the answer

i got -.0012 but its wrong

Something is wrong with what you are trying to calculate. The first term has dimensions of millimoles and the second term has dimensions of millimoles/mg. That cannot happen in a scientific calculation. I suspect your formula is wrong.