In how many ways can a mail carrier place three letters in five mailboxes if each box may receive more than one letter?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

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?

What is the factored form of the following expressions? d^2 – 13d + 36