When x=1/2, what is the value of 8x-3/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?

Write an equation for the function that includes the points (2,100)and (3,100)

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5