Which one of the following statements is incorrect? The opportunity cost of holding money balances is the interest that could have been earned if the money had been used to purchase interest-bearing assets instead. Anyone who wishes to enter into transactions in a monetary economy has to holid money as a medium of exchange. The quantity of money demanded for transaction purposes depends on the level of income. The quantity of money demanded for speculative purposes is positively related to the interest rate.

The marketing manager for a newspaper has commissioned a study of the advertisements in the classified section. The results for the Wednesday edition showed that 187 are help-wanted ads, 498 are real estate ads, and 330 are other ads. a. If the newspaper plans to select an ad at random each week to be published free, what is the probability that the ad for a specific week will be a help-wanted ad? b. What method of probability assessment is used to determine the probability in part a? c. Are the events that a help-wanted ad is chosen and that an ad for other types of products or services is chosen for this promotion in a specific week mutually exclusive? Explain.

Find all solutions of the equation in the interval \( [0,2 \pi) \) \[ \cot ^{2} x+2 \csc x=-1 \] Write your answer in radians in terms of \( \pi \). If there is more than one solution, separate them with commas.

Find the greatest common factors (GCF) of the following numbers. 1. Using Venn diagram method a. 12,18 b. 24,64 c. \( 45,63,99 \) 2. Using prime factorization method a. 24,54 b. 108,104 c. \( 180,270,1,080 \)

b) \( \frac{3}{5} \) of 1 litre \( =\ldots \) d) \( \frac{4}{5} \) of \( 2^{1 / 2} \ell=\ldots \)

\( \int e ^ { \sec 6 x } - \sec 6 x \tan 6 x d x \)