\( \begin{array}{rl}\text { c } R & R=\{x: x \text { is a perfect square and } 25 \leqslant x \\ & \leqslant 100\}\end{array} \)

281. Road grade. A local road has a grade of \( 6 \% \). The grade of a road is its slope expressed as a percent. Find the slope of the road as a fraction and then simplify. What rise and run would reflect this slope or grade?

Which set of ordered pairs does not represent a function? Answer \( \begin{array}{l}\{(5,-3),(1,-1),(-1,8),(9,-1)\} \\ \\ \{(-1,-3),(2,-5),(-2,0),(6,-3)\} \\ \\ \{\{(-7,-3),(-6,4),(-2,-5),(0,-3)\} \\ \\ \{(7,1),(7,-7),(-8,3),(9,5)\}\end{array} \)

Use technology to find points and then graph the function \( y=\sqrt{x}+5 \) following the instructions below. Plot at least four points with integer coordinates that fit on the axes below. Click a point to delete it.

6) Use the Laws of Logarithms to expand the expression. \( \log _{2}\left(\frac{x\left(x^{2}+1\right)}{\sqrt{x^{2}-1}}\right) \)

3. Todd volunteers for the coast guard and gets to ride in the coast-guard helicopter. The pilot tells him that they will fly at a height of 148.5 metres above the ground. He adds that the flying height times 8,000 gives the square of the visible distance. How many kilometres will they be able to see?