\( Q=\{x: x \) is a number with the tens digit larger than the units digit and \( 20 \leq x \leq 30\} \)

7) Use the Laws of Logarithms to combine the expression: \( 4 \log x-\frac{1}{3} \log \left(x^{2}+1\right)+2 \log (x-1) \)

3) \( \sqrt{675}-\sqrt{432}+\sqrt{234} \)

Use technology to find points and then graph the function \( y=2 \sqrt{x+7}-4 \) following the instructions below. \[ \text { done plotting points } \] Plot at least five points with integer coordinates that fit on the axes below. Click a point to delete it.

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.

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