Evaluate the reciprocals of the following

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

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?

Plz hurry evaluate the expression a+b where a=8 and b=19