Help me.

Which of the following is the true for f(x) = 5cos

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?

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?