The powers and duties of the Bureau of Internal Revenue are:
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To get your TIN if your ID was lost, just call the trunkline of the the BIR. Here in the Philippines, the number is (02) 9817000. You will be directed to a BIR employee and he/she will ask you some information such as your name and birthday. Then, you will have your TIN after you have provided the necessary information. It would take only a few minutes.
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.