7.78 rounded to the nearest ones

Three coins are flipped. what is the probability that there will be at least two tails?

Hello can you me find all the products

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?