a train journey from paris to amsterdam took 3 hours 24 minutes. The total distance was 433.5km. work out the average speed of the train

Which of the following expressions are equivalent ?

What is the reflection image of (5,-3) across the line y = -x?

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?