Question

The graph shows the relationship between the total cost and the number of gift cards that Raj bought for raffle prizes.

Answer 1

What would be the cost for 5 of the gift cards?

$80

$90

$100

$110

Answer : $100

The graph is attached below

From the graph we can see that,

When the number of gift cards = 1 then cost = $20

When the number of gift cards = 2 then cost = $40

When the number of gift cards = 3 then cost = $60

When the number of gift cards = 4 then cost = $80

The cost is increasing by 20 dollars for each card

Hence, cost = $100 for 5 of the gift cards.

Answer 2

Answer:

$100

explanation:

Each gift card goes up in price $20

(1,20) --> (2,40)

40-20=20

(2,40) --> (3,60)

60-40=20

So, when 4 gift cards equal $80 (4,80)

80 + 20 = 100

Hence the answer when there are 5 gift cards, it costs $100

Hope it helps!