2. \( \begin{array}{r}5.76 \\ +\quad 2.34 \\ \hline 8.16\end{array} \)

Round \( 8.91 \) to the nearest tenth.

\( 16 kg 600 g \div 5 \)

2. Two shops are both selling the same Phone. Shop A normally sells it for 540 rials and Shop B normally sells for 620 rials. During a sale, Shop A reduces the price by \( 25 \% \) and Shop B reduce the price to by \( 30 \% \). Which Shop is selling the phone at the cheapest price in the sale? Show your workings ( 3 mark)

Effectuer les calculs suivants : \( \begin{array}{ll}A=(+18)+(-20) & ; ; \\ D=8+(-7) & ; \\ G=40+(-60) & ; \\ 1=4+(-4)\end{array} \)

Is the number 15 a composite number? Explain why or why not.