What is the distance between the following points 63, 77, 79, 85

In the diagram below what is the approximate length of the minor arc ab

Find the roots of the equation below. x^2 - 6 + 9 = 0

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?