Write an equation of the line shown in each graph

Which statements are true? see picture

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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?