If D = 2 - 9n² and C = n +3 +4n^2?, find an expression that equals 3D - C in standard form.
Need help ASAP please

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

Solve -.016x= -16. need solving this

Triangle xyz, with vertices x(-2, 0), y(-2, -1), and z(-5, -2), undergoes a transformation to form triangle x? y? z? , with vertices x? (4, -2), y? (4, -3), and z? (1, -4). the type of transformation that triangle xyz undergoes is a . triangle x? y? z? then undergoes a transformation to form triangle x? y? z? , with vertices x? (4, 2), y? (4, 3), and z? (1, 4). the type of transformation that triangle x? y? z? undergoes is a .