You have to change the denominator of 6/10 into 100 then you will get 60/100 then you add 15/10+60/100
Can be both, because if all three were negative, it would be
negative*negative= positive
positive*negative=negative
example: -1*-1*-1=-1
but if all three were positive, it would obviously be positive, because any number of positives can't make negatives in multiplication.