I got 7.64 because you round the 3 to 4 since the 7, in the 3rd decimal place is higher than 5
5 would be the answer to it
3200620009 is the answer to your question
86. Is a negative slope because it slants down from left to right.
87. Is positive slope because it slants up from left to right.
88. Is an undefined slope because it is vertical.
89. Is has a slope of zero because it is horizontal.