2x ≡ 6(mod 4)

A penny of mass 3.1 g rests on a small 29.1 g block supported by a spinning disk of radius 8.3 cm. The coefficients of friction between block and disk are 0.742 (static) and 0.64 (kinetic) while those for the penny and block are 0.617 (static) and 0.45 (kinetic).

Find a vector function that represents the curve of intersection of the two surfaces of the cylinder x^2+y^2=4 and the surface z=xy.

You are conducting a Goodness of Fit hypothesis test for the claim that all 5 categories are equally likely to be selected. Complete the table. Report all answers correct to three decimal places.
$\begin{array}{|cccc|}\hline \text{ Category }& \text{ Observed Frequency }& \text{ Expected Frequency }& \text{ (obs-exp)^2/exp }\\ \text{ A }& 15\\ \text{ B }& 19\\ \text{ C }& 23\\ \text{ D }& 18\\ \text{ E }& 5\\ \hline\end{array}$
What is the chi-square test-statistic for this data?${\displaystyle {\chi }^2=}$
At the alpha = 0.05 level, what is the conclusion for this test?
Fail to reject the null hypothesis
Reject the null hypothesis
Report all answers accurate to three decimal places.