The Smiths took out a $130,000, 30-year mortgage at an APR of 6.5%. The monthly
payment was $821.69. What will be their total interest charges after 30 years?

I = $ × 12 × - $130,000 = $
Monthly payment years

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step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

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