Question

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

A graph titled Cost of Gift Cards. The x-axis shows the number of gift cards, numbered 1 to 9, and the y-axis shows the total cost in dollars, numbered 10 to 90. Blue diamonds appear at points (1, 20), (2, 40), (3, 60), (4, 80).
What would be the cost for 5 of the gift cards?

$80
$90
$100
$110




Peaches are being sold for $2 per pound.The customer created a model to represent the total cost of peaches bought. If x represents the number of pounds of peaches bought and y represents the total cost of the peaches, which best describes the values of x and y?

The values of both x and y can be any real number.
The values of both x and y will be real numbers greater than or equal to 0.
The value of x and y will always be zero
The value of x can be any real number greater than or equal to 0, but the value of y must be an integer greater than or equal to 0.

Answer 1

1) $100 — each card costs $20, so 5 × $20 = $100.

2) "The values of both x and y will be real numbers greater than or equal to 0." — x (pounds) can be any nonnegative real (including fractions) and y = 2x is also nonnegative real.