PLEASE ANSWER ASAP
160 + 12m = 400
what is m?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

What’s the answer ? use the picture to see the problem