Miguel has 400 minutes of pre-paid service on his phone each month.If he used the phone for 3 1/2 hours this months,how many pre-paid minutes of service remain?

1.the viceroy population remained fairly steady over the 3 years recorded.2.the average number of zebra swallowtails over all three samples will be less than the number  recorded in year 13.there was a mistake in the sample for year three as the painted ladies were extinct in year 2