If there are 4 friends and 1 flashlight and only two of them can pass at a time then
that will mean that has to pass 2 times per person and the last time only one
for 32 will be 31*2 + 1 = 63
in a general matter will be
T = (X-1)*2 + 1
T = 2X - 1
so for 3 friends will be (this does not take into consideration the flashlight guy)
T = 3*2 - 1 = 5 times
negative x negative = positive
negative x positive = negative
positive x positive = positive
so answers are
1 = positive
2 = positive
3 = negative
4 = negative
5 = positive
Answer is B
-0.6- (-0.4)= -0.6+0.4= -0.2