If two lines do not intersect, they are parallel

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?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

How many grams the dog will eat in 3 days?