Question

Not really sure how to do this with a negative number

Answer 1

Note that (-1/7) = -(1/7).

So you have

1 -1 -1
--- * ------ = ------
2 7 14

Answer 2

1/2*(-1/7) = - (1*1)/(2*7)= - 1/14

(+)*(-) = (-)

Answer : - 1/14