The income tax T owed in a certain state is a function of the taxable income I, both measured in dollars. The formula is given below.

T = 0.14I − 400

(a) Express using functional notation the tax owed on a taxable income of $13,000.

T( )

Calculate the tax owed on a taxable income of $13,000.

$

(b) If your taxable income increases from $13,000 to $16,000, by how much does your tax increase?

$

(c) If your taxable income increases from $16,000 to $19,000, by how much does your tax increase?

$