To calculate the total cost of the stamps, we first need to find the individual costs of the fifty cents and thirty cents stamps separately.
Cost of fifty cents stamp = $0.50
Cost of thirty cents stamp = $0.30
Now, we can find the total cost by multiplying the individual costs with the quantity purchased and then adding them together.
Total cost = (Cost of fifty cents stamp * Quantity of fifty cents stamps) + (Cost of thirty cents stamp * Quantity of thirty cents stamps)
Total cost = ($0.50 * x) + ($0.30 * 3)
Total cost = $0.50x + $0.90
Therefore, the total amount spent by Trisha on the stamps would be $0.50x + $0.90.
Trisha bought x fifty cents stamps and 3 thirty cent stamps. How much did she spend altogether on the stamps? But its not 0.5 plus 0.9
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