En un triángulo ABC recto en C, se cumple que tg B = 0,75 y c - a = 3 cm. Calcula su perímetro.

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

How to do this , and can some one explain

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?