What would (2,π/4) become if r is -2?

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Which expression is equivalent to 4 square root 6 divided by 3 root 2

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !