Is cot 4 a is equal to tan (a - 20) where 4a is an acute angle find the value of a

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000