The graph shows the relationship between the total cost and the number of gift cards that raj bought for raffle prizes.
what would be the cost for 5 of the gift cards?

$100

Step-by-step explanation:

We can see from the graph that the rate of change is $20.  This is because for every increase in x, the value of y increases by $20.

Going from this, the value at x=4 is $80; this will make the value at x=5

80+20 = 100

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15.15

Step-by-step explanation: