If \( f(x)=3-2 x \) and \( g(x)=\frac{1}{x+5} \), what is the value of \( \left(\frac{f}{g}\right)(8) ? \)

(6) \( \left(-x^{2}+x+3\right) \)

Given \( P=\{8,5,3,2,6, x\} \) and \( Q=\{2,7 \), \( y+3,6,3,5\} \). If \( P=Q \), find the values of \( x \) and \( y \).

B. \( 6^{\text {th }} \) week II. Work out (Show each siens learly) 6. In an arithmetic sequence, if the \( p^{\text {th }} \) term is \( q \) and the \( q^{\text {th }} \) term is \( p \), find the \( (p+q)^{\text {th }} \) term. Find the first term of the sequence \( 4,12,36,108 \ldots \) which exceeds 20,000 . 8 . Find \( S_{100} \) when the general term \( a_{n}=\frac{n}{n+1}-\frac{n+1}{n+2} \) 9 . Find the absolute maximum valuc of \( f(x)=2 \cos x+x \) on \( [0,2 \pi] \) ? 10. Find the interval on which \( f(x)=x \sqrt{x+1} \) (s increasing?

8. จงหาคำตอบของสมการ \( \frac{3}{4} \mathrm{x}-\frac{9}{2}=18 \)

Express the answer in simplest radical form. \[ 3 x^{3} y^{2} \sqrt[3]{375 x^{9} y^{5}} \] \( x \)