In the laboratory analysis of samples from a chemical process, seven samples from the process are analyzed daily. In addition, a control sample is analyzed twice each day to check the calibration of the laboratory instruments. How many different sequences of process and control samples are possible each day? Assume that the seven process samples are considered identical and that the two control samples are considered identical. How many different sequences of process and control samples are possible if we consider the seven process samples to be different and the two control samples to be identical? a. 36, 2520 O b.21, 2520 Oc. NONE O d. 36, 181440

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A total of $6000 is invested for 5 yr with a total return of $1080. Part of the money is invested in a fund that returns the equivalent of 2% simple interest. The rest of the money is invested at 4% simple interest. Determine the amount invested in each account.

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