An architect is designing a water fountain for a park. she uses the given function to model the water jets flowing from the fountain's nozzles, where h(x) gives the height of the water jet, in feet, x feet from its starting point. select the two adjacent columns that show an interval with an average rate of change of -0.3.

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?