I need to know the displacement for the 12km+4km+1km= 17km

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?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.