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i already got that one. its c

great

and the other one?

well, any thoughts?

in order to get back where he started, he has to run the same distance in both directions

c?

yup

hint:
-10 - (-8) = -10 + 8 means we go 10 to the left, then 8 to the right

um, i land on 6

try again...
-10 + 8 = ?

-2

right, so our answer is..?

b?

yes

2+(-7), means that I have to shift to right by 2 units, then I have to go to left by 7 units

so A?

so we have to move of 7 units from 2, to left

yes! correct!

6+(-7) means 6 units from origin to right and 7 units from the point x=6 to left

so A?

no, since in A both displacements are to right

oh sorry i meant b

correct!

what is -30-16=...?

-46

ok! now, please neglect the minus sign, what do you get?

so it would be b because the value is always positive

yes!

at the step #2 the applied property is not the distributive property

is it b?

yes! we have applied the associative property

by the way, why you posted in history section?

oh i dont know sorry , ill change that after.. lol

lol :)

we have the subsequent rule:
\[\Large \left( - \right) \cdot \left( - \right) = + \]

b?

correct!

c?

yes!

so i do this :
21/4 * 15/2

i got 9/4

i got 9/4

then what is the right option?

A?

correct!

is 2 and 1/4 positive or negative?