Which of the following equations matches the standard form of a quadratic function?
Group of answer choices

y = a x 2 + b x + c

y = m x + b

y = a ( x − h ) 2 + k

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?