A timber company in northern Georgia is harvesting pine trees to sell by the cord. A typical acre produces 13.85 cords of wood, and the company sells each cord for \( \$ 19.20 \). How much money can the timber company expect to make from each acre of pine trees?

Find all excluded values for the expression. That is, find all values of \( t \) for which the expression is undefined. \( \frac{t+1}{t^{2}-16} \) If there is more than one value, separate them with commas.

What is the image of \( (3,-7) \) after a reflection over the line \( y=x \) ?

e. \( x \)-intercepts \( (7.9,0) \) and \( (-7.9,0) \) point \( (-4,-4) \)

Brianna takes her car to the Super Suds car wash once every month. She spends \( \$ 8.95 \) each time. How much did she spend on car washes last year?

9. Suppose the joint pdf of \( (X, Y) \) is \[ f(x, y)=\left\{\begin{array}{cc}x^{2} y, & x^{2} \leqslant y \leqslant 1 \\ 0, & \text { otherwise }\end{array}\right. \] (1) Find the constant \( c \); (2) Find the marginal probability density functions of \( X \) and \( Y \).