Aboy who is 5 ft tall casts a shadow 2 ft long find the height of the pole if it casts a shadow 2 ft yards long

Can someone me and plz do the problem

Is a positive integer raised to a negative power always positive

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?