exam Maths Puzzle Numerical Ability

I am a senior in high school and want to know if my answer is correct. How many different ways are there for an admissions officer to select a group of 7 college candidates from a group of 19 applicants for an interview? Answer: 133

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Please help me write:
[2(cos (5pi/16) + i sin (5pi/16))]^4 in the standard form a + bi.

Thank you, Tami When Jim cleaned out the pool, he found 20 nickels and quarters. The collection of nickels and quarters totaled $2.60. How many quarters did Jim find?