What is the frequency of the function f(x)? f(x)=1/4cos(2x)+5

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)-144x+360 what am i doing wrong?

Nikolas calculated the volume of the prism. his work is shown below.

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?