12. Park Crest Middle School has a population of about \( 4008^{\text {th }} \) graders. Park Crest is one of several middle schools in a state which has a total of \( 806,2408^{\text {th }} \) graders. Use powers of ten to estimate about how many times greater the state's population of \( 8^{\text {th }} \) graders is compared to the number of \( 8^{\text {th }} \) graders at Park Crest Middle School.

19. Эcenreruse: \( \frac{4^{0.5}}{0,5^{4}}= \) A) 4 Б) 8 B) 16 D) 32 D) 64

Complete the conjecture that describes the pattern in the sequence. \( 4,8,12,16,20 \)

Evaluate each expression. \[ \begin{array}{l}\text { (a) } \log _{7} \frac{1}{7}=\square \\ \text { (b) } \log _{3} 27=\square\end{array} \]

Use the properties of logarithms to expand the expression. \( \ln \left(5 m^{6}\right) \) \( \ln \left(5 m^{6}\right)=\square \)

Determine whether the following equation defines \( y \) as a function of \( x \). \[ \begin{array}{l}x^{2}+y^{2}=121 \\ \text { Yes noes the equation } x^{2}+y^{2}=121 \text { define } y \text { as a function of } x \text { ? } \\ \text { No }\end{array} \]