The function f(x) = 0.85x + 3.99 models the total cost of purchasing x key chains from an Internet company that charges shipping. The function
g(x) = 1.10x models the total cost of purchasing x number of the same
key chains from an Internet company that does not charge shipping.
What is the best approximation of the number of key chains for which
the two companies charge the same amount?

14

16

15

17

Are the corresponding angles congruent? explain why or why not.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

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