\( \begin{array}{l}(15,21) \\ \text { 8. } 3^{5} \div 3+3-3(3) \\ \text { (46) } \frac{5.2 \times 10^{7}}{1.3 \times 10^{4}} \\ \text { 12. }(12.4+2)(1-0.998)\end{array} \)

3) \( \frac{3}{2}+\left(-2 \frac{5}{8}\right) \)

\( \begin{array}{ll}\text { 1) } \frac{3}{2}-3 \frac{1}{8} & \\ \begin{array}{ll}\text { A) }-1 \frac{17}{40} & \text { B) } \frac{39}{40} \\ \text { C) }-1 \frac{3}{56} & \text { D) }-1 \frac{5}{8}\end{array} \$ \begin{array}{ll}\end{array} \text { l }\end{array} \)

\( \frac{5}{8} \) \( \begin{array}{ll}\text { A) } 6.25 & \text { B) } 0.625 \\ \text { C) } 0.0625 & \text { D) } 0.675\end{array} \)

\( \begin{array}{ll}\text { 31) } 9.25 & \\ \text { A) } 92 \frac{1}{2} & \text { B) } \frac{37}{40} \\ \text { C) } 9 \frac{3}{4} & \text { D) } 9 \frac{1}{4}\end{array} \)

28) \( \frac{1}{5} \) \( \begin{array}{ll}\text { A) } 0.4 & \text { B) } 0.2 \\ \text { C) } 150 & \text { D) } 0.02\end{array} \)