What is 0.2 x 0.8. Please help

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?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

The line of best fit for the scatter plot below passes through which pair of points?