Mia opens a coffee shop in the first week of january. the function w(x) = 0.002x3 -0.01x2 models the total number of customers visiting the shop
since it opened after x days. she then opens an ice cream parlor in the month of february. the function r(x) = x2 - 4x + 13 models the total number
of customers visiting the parlor since it opened after x days
which function represents the difference, d(x), in the number of customers visitin
a.
d(x) = 0.002x3 + 1.01x2.4x + 13
b. d(x) = 0.002x3 + 0.99x2 + 4x - 13
c. d(x) = 0.002x3 - 1.01x2 + 4x - 13
d. d(x) = 0.002x3.0.99x2 - 4x + 13

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