Verified Answer :

enderdude153
  1. is 9
    and the other ones i dont really know
  1. replace the x by 2  and work it out 
    = 7(2) - 5

    3.  that cost $7.50 each  and $0.25 is taken off the cost of  any number you perchasse

    so it 0.75n - 0.25

    4.  Hint  the  second  (y) values are obtained from the first (x) values by multiplying  by 2

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