Number of pennies in a stack that is 1ft high

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?

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20