F(x)= -x^2+8x-20 find the equation of the min/max line

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days