Shanna writes the formula f(x + 1) = 2.5%) when f(1) = 2 to represent this sequence: 2,5, 12.5, 31.
which error did shanna make?
she used the incorrect common ratio.
she used the incorrect initial value.
she should have multiplied by f(x) rather then have it as an exponent.
she treated the sequence as geometric instead of arithmetic.

The green family is a family of six people. they have used 4,885.78 gallons of water so far this month. they cannot exceed 9,750.05 gallons per month during drought season. write an inequality to show how much water just one member of the family can use for the remainder of the month, assuming each family member uses the same amount of water every month.