You buy cards to send to family and friends for their birthdays. the function y=2.5x represents the cost y of the number of cards x you buy. is 8 in the domain? explain. is 40 in the range? explain

9514 1404 393

  yes

  yes

Step-by-step explanation:

The domain of the function is the number of friends and family for which you buy birthday cards. The question is equivalent to asking, "is it reasonable that you would buy birthday cards for 8 members of friends and family?"

Yes, I believe that 8 is reasonably in the domain.

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The range of the function is the set of possible values the function may have. Here, those would correspond to integer values of x. That is, range values will be whole number multiples of 2.5. 40 is one such multiple:

  2.5(16) = 40

If you buy birthday cards for 16 members of friends and family, your cost will be $40. Yes, I believe 40 is reasonably in the range.

answer: y=4000x+14000

step-by-step explanation: