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How do you write the inverse of a function?

Can you have the inverse of a many-to-one function and still gets a function as defined?

To be able to get an inverse of a function, the function should be one-to-one.

True or False?

Aubrey and her mother are planning to have a debut party at Venue 88. the reception hall has a flat rate of 2,000.00 pesos and an additional rental fee of 50.00 per guest. if the allocated budget for the reception hall expenses is limited to 10,000.00 pesos, how do you express the cost as a function of the number of guests?

Aubrey and her mother are planning to have a debut party at Venue 88. the reception hall has a flat rate of 2,000.00 pesos and an additional rental fee of 50.00 per guest. if the allocated budget for the reception hall expenses is limited to 10,000.00 pesos, what is the inverse of the cost as a function of the number of guests?