What is 39 x (15÷3) - 16 using pemdas

Find the quotient with the restriction.

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?

Multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2