The expression (m--m) is equivalent to

a) 2m-2n
b) 2m
c) -2n
d) m-n

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?