8 chalenge Chloe is sorting items at a thrift store. She finds a box of tiny blocks that has 1.344 written on the outside of the box. She can see that each layer in the box has 64 blocks. a How many layers of blocks are there? b What is another way Chloe could arrange the 1,344 blocks to fit in a different box?

\( \int \sqrt { x } e ^ { - \frac { x } { ab } } d x \)

A florist works out that she need 125 mm of ribbon per bunch of flowers. Calculate the total cost of ribbon, If the ribbon costs R9, 80 per metre; and she needs to wrap 120 bunches of flowers.

2. Calcule, aplicando as regras da derivação: \( \begin{array}{lll}\text { a) } y=\frac{x^{4}-2}{10} & \text { b) } y=\left(\frac{3 x-2}{x}\right)^{2} & \text { c) } y=\frac{2}{x^{2}}-\frac{5}{x^{5}} \\ \text { d) } y=\frac{2 x^{2}-3}{x^{3}} & \text { e) } y=\frac{1}{x^{2}} & \text { f) } y=\frac{1}{x^{4}} \\ \text { g) } y=\frac{x}{2 x^{2}+1} & \text { h) } y=\frac{2 x+3}{x^{2}-1} & \text { 1) } y=\frac{x}{x^{2}+2 x+1} \\ \text { j) } y=\frac{x^{2}+1}{1-3 x^{3}} & \text { k) } y=-\frac{5}{\left(2 x^{5}-x^{3}\right)^{2}} & \text { if } y=\frac{x^{2}-5}{x^{3}+1}\end{array} \)

Find the equation of the line tangent to the graph of \( f \) at the indicated value of \( x \). \( f(x)=7-\ln x ; x=1 \) \( y=-x+8 \)

e) \( \frac{\cos 1}{\sin 1} \cdot \frac{\cos 1+\cos 2}{\sin 1+\sin 2} \cdot \ldots \cdot \frac{\cos 1+\ldots+\cos n}{\sin 1+\ldots+\sin n} \)