Simplify each expression 81/3

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

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?

∆red ≅ ∆ by rule will give brainiest if possible