Wright 1.56 x 10^4 standard notation?

If δmtv is reflected across the y-axis, what are the resulting coordinates of point m? a) (-2, 5) b) (-5, 2) c) (5, -2) d) (-2, -5)

If f(x)= 3x+6 which of the following is the inverse of f(x)

If the value of cos330°is√3/2 then find cos 165°.