How do you calulate unit rate of 510 miles per 6 hours

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?

Which sequence is arithmetic? 6, 12, 15, 21, 7, 14, 21, 36, 8, 16, 32, 64, 9, 18, 27, 36,

What are the cordinates for point a?