Final answer:
To find out how much money 30 basketball cards would cost, set up a proportion using the given information and solve for x. Therefore, 30 basketball cards would cost $18.00.
Step-by-step explanation:
To find out how much money 30 basketball cards would cost, we can set up a proportion using the given information. We know that 15 basketball cards cost $9.00, so we can set up the proportion:
15 cards / $9.00 = 30 cards / x
To solve for x, we can use cross multiplication. Cross multiplying gives us:
15x = 30 * $9.00
Next, we can divide both sides of the equation by 15 to isolate x:
x = (30 * $9.00) / 15
Simplifying the expression gives us: x = $18.00
Therefore, 30 basketball cards would cost $18.00.