Winston hada test average of 86.2 last semester. His first four test grades were \( 81,88,93 \), and 77 . Use the formula \( \bar{x}=\frac{x_{1}+x_{2}+\ldots+x_{n}}{n} \) to find his score on the fifth test.

Write the coefficient of: (a) \( y \) in \( -3 x^{2} y \)

\( \frac{(x-12)}{y}=18 \) where \( y=2 \)

\( x y+8=24 \quad \) where \( y=2 \)

1) \( (3 x)\left(2 x^{2}\right) \) 4) \( \left(x^{3}\right)\left(x^{2}+x\right)\left(3 x^{3}\right) \) 7) \( \left(x^{4}+3 x^{3}+2 x^{2}+11 x\right)\left(x^{3}\right) \)

If \( (2 a-5)(3 a-2)=6 a^{2}+k a+10 \), then \( k= \) \( \begin{array}{llll}\text { (a) } 15 & \text { (b) } 19 & \text { (c) }-19 & \text { (d) } 6\end{array} \)