Is the number 14 a prime number? Explain why or why not.

Round \( 8.91 \) to the nearest tenth.

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

\( \left.\begin{array}{l}\text { 2. Two shops are both selling the same Phone. Shop A normally sells it for } 540 \text { rials and } \\ \text { Shop B normally sells for } 620 \text { rials. During a sale, Shop A reduces the price by } 25 \% \text { and } \\ \text { Shop B reduce the price to by } 30 \% \text {. } \\ \text { Which Shop is selling the phone at the cheapest price in the sale? Show your workings } \\ \text { clearly. ShopA: } \\ \text { (3 mark) }\end{array} \right\rvert\, \)

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

\( 9 kg 310 g \div 7 = \)