Your classmate simplified the following rational expression and asked you if you got the same answer. determine whether the answer below is correct. if it is not correct, simplify the expression. show all of your work.
rational expression: x squared minus 1, over x squared minus 4x minus 5, divided by 2x squared plus 4 x, over 6x squared minus 30x
your friend's 2x times the quantity x minus 1 times the quantity x plus 2, all over 6x times the quantity x minus 5 times the quantity x minus 5

Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. here are data on the "penetrability" of the same type of soil at two levels of compression. penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. compressed soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16 intermediate soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26 use the data, omitting the high outlier, to give a 95% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. compute degrees of freedom using the conservative method. interval: to