graciecrider
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Tavon has a gift card for $135 that loses $3 for each 30-day period it is not used. He has another gift card for $115 that loses $2.50 for each 30-day period it is not used.
1-what will the value of each cars be when they have equal value
2- if x is the number of 30-day periods then what number of days can be used to find the number of 30-day periods will it be til they're equal

Respuesta :

texaschic101

Answer:

Step-by-step explanation:

let x be the number of 30 day periods

135 - 3x = 115 - 2.50x

135 - 115 = -2.50x + 3x

20 = 0.50x

20 / 0.50 = x

40 = x

135 - 3(40) = 135 - 120 = 15

115 - 2.50(40) = 115 - 100 = 15

they will each be $ 15

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so there are 40 thirty day periods.....40 * 30 = 1200 days

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