Obtain the time-average autocorrelation function of the signal x(t)=3 6cos(20πt) 3sin(20πt) and obtain the power spectral density of the signal. What is its total average power?.

The level of co2 emissions, f(x), in metric tons, from the town of fairfax x years after they started recording is shown in the table below. x 2 4 6 8 10 f(x) 26,460 29,172.15 32,162.29 35,458.93 39,093.47 select the true statement.

Arandom sample of 150 high school students were asked whether they have a job. the results are shown in the table. have a job do not have a job male 48 35 female 41 26 select a ord or phrase from the drop-down menus to correctly complete the statements describing the association.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)