Find the circumference of the circle if the square has a area of 144m^2 . use 3.14 for pi

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

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?

Is this a polynomial function? i need to know asap