Please answer my question

Need on this one asap im almost done with this subject

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?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?