Please help. Find the exact value by using a half-angle identity. tan(7pi/8)

1 [square root 2]

1 - [square root 2]

-1 + [square root 2]

-1 - [square root 2]

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?

Which of the following represents a function? 50 !

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question