2/5 x = 100 what is the value of x

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?