In the diagram, what is the measure of n?

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?

2x minus y equals 6, x plus y equals negative 3

Tom drove 206 miles in 3.9 hours. estimate his average speed.