Xavier mixes \( 2 \frac{4}{5} \) buckets of coarse sand with \( 1 \frac{1}{5} \) buckets of cement to make a special type of concrete. How many buckets of concrete will he make? Tasneem is an intern at ZX Communications Agency. She earns R4 500 a month. \( \begin{array}{l}1.2 .1 \\ 1.2 .2\end{array} \quad \) Write the number 4500 in scientific notation. 10 A Gudani MX 360 Pro laptop could be bought at a cash price of R6 500 or through

Let's break down the problem step by step. ### Part 1: Mixing Sand and Cement 1. **Convert Mixed Numbers to Improper Fractions:** - For coarse sand: \[ 2 \frac{4}{5} = 2 + \frac{4}{5} = \frac{10}{5} + \frac{4}{5} = \frac{14}{5} \] - For cement: \[ 1 \frac{1}{5} = 1 + \frac{1}{5} = \frac{5}{5} + \frac{1}{5} = \frac{6}{5} \] 2. **Add the Two Fractions:** - To add \(\frac{14}{5}\) and \(\frac{6}{5}\): \[ \frac{14}{5} + \frac{6}{5} = \frac{14 + 6}{5} = \frac{20}{5} = 4 \] Thus, Xavier will make **4 buckets of concrete**. ### Part 2: Writing 4500 in Scientific Notation To express the number 4500 in scientific notation, we need to write it in the form \( a \times 10^n \), where \( 1 \leq a < 10 \). 1. **Convert 4500:** - Move the decimal point 3 places to the left: \[ 4500 = 4.5 \times 10^3 \] Thus, **4500 in scientific notation is \( 4.5 \times 10^3 \)**. ### Summary of Answers: 1. Xavier will make **4 buckets of concrete**. 2. The number 4500 in scientific notation is **\( 4.5 \times 10^3 \)**.