exam Maths Puzzle Numerical Ability

find the value of sin (-120 degrees)

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Add or Subtract as indicated: These are confusing to me. Please help!

(7x^2y-4xy+9xy^2)-(8x^2y+8xy+8xy^2) You plan to invest $12000 in two funds paying 4.25% and 5.5% simple interest. Your goal is to obtain a total annual interest income of $1000 from the investments. What is the small