Simplify the following expression.
3x4 + 2x3 - 5x2 + 4x2 +6x-2x - 3x4 + 7x3 - 3x3

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

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