Ricky draws a square. He claims that any rotation about the center of the square that is a multiple of 30 degrees will carry the square onto itself. Which statement best describes Ricky’s claim? A. Ricky’s claim is incorrect since not all rotations that carry a square onto itself are multiples of 30 degrees.
B. Ricky’s claim is incorrect since not all rotations that are multiples of 30 degrees carry a square onto itself.
C. Ricky’s claim is correct since any rotation that carries a square onto itself is a multiple of 30 degrees.
D Ricky’s claim is correct since any rotation that is a multiple of 30 degrees carries a square onto itself.

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