12. Ms. Ann Thrope went to the outlet mall because there was a \( 60 \% \) off sale on all items. As a senior citizen, she receives an additional \( 7 \% \) discount. Computing \( 100-(60+7) \), she thought she would pay \( 33 \% \) of the original price. Her nephew computed \( 0.4 \cdot 0.93 \) and said she would pay \( 37.2 \% \) of the original price. a. Who was right? b. Her niece computed \( 0.93 \cdot 0.4 \) and also said Ms. Thrope' would pay \( 37.2 \% \) of the original. Why did Ms. Thrope's niece and nephew get the same answer?

(smeitesi)

A restaurant made \( \$ 5.987 \) on Friday It made \( \$ 1,527 \) more on Saturday than on Friday. On Sunday, the restaurant made \( \$ 2,641 \) How much money did the restaurant make in the days? Is your answer reasonable? Explain.

5) 6 units up and 2 unit down

B: Voltaic cells - measuring cell potentials. 2.4 Use the \( \mathrm{Mg} / \mathrm{Pb} \) electrochemical cell to answer the following questions: (a) If electricity is a flow of electrons, explain how the flow of electrons occurs. (2) (b) Write down the half-reactions occurring at each electrode (anode / cathode) (2) (c) What is the net cell reaction? (1)

Execute 1 . Write the following set of items according to the general characteristics of the item. A. A set of all positive integers in the range of 15 to 21 . B. A set of all relational integers of absolute values less than 1 . C. The cell surface set of circles has radii 1,2 and 3 . D. Set \( \left\{x / x \in Z: x^{2} \leq 13\right\} \).