Find a recursive rule for the sequence 2 4 6 10

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

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