Simplify -|-5 + 2|. i'm not good with math, can someone me how to simplify, i have no clue to solving these questions that ask me to simplify, on my online schooling i wish to get better. for the time : )

What properties allow transformation to be used as a problem solving tool

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?

Una caja de galletas contiene 16 paquetes y cada una de estas tiene 12 galletas y se quieren repartir entre 6 niños ¿de cuantas galletas le toca a cada niño?