A cell phone company charges $60.00 a month for up to 1 gigabyte of data. The cost of additional data is $0.05 per megabyte. If drepresents the number of additional megabytes used and crepresents the total charges at the end of the month, which equation can be used to determine a user's monthly bill

$18 was the price of the t-shirt

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the answer is a

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39.00 x 24 = total installment price

carrying installment price - cash price

needed to save the .00/

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ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3