How do find the volume of 20cm and 30cm and 45cm

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?

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart