+3.5-12.8 = -9.3
-c+d =- (-3.5)+(-12.8) =+3.5-12.8 = -9.3
substitute -3.5 for c and -12.8 for d then do the math thats all you have to do when they give substitution numbers in the question.
am I right guys ?
thanks . You can give me a medal :)
lol yeah :)
whats ur name
I told :P
cool u play 20 question
do u play the game 20 questions
actualy it is 16.3 i redid my math it is b
But How ?
look if u substitute -3.5 for c and - 12.8 for d that would give u the equation -3.5+(-12.8 which =16.3 add it up in a calculator and you willl see