Simplify the complex number square root of -16 +8

When turned about its axis of rotation, which shape could have created this three-dimensional object?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

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?