The demand equation for a certain brand of metal alloy audiocassette tape is 
, where x represents the number (in thousands) of ten-packs demanded each week when the unit price is $p. How fast is the quantity demanded increasing when the unit price/ten-pack is $10 and the selling price is dropping at the rate of $.13/ten-pack/week? Round the answer to the nearest integer.
?
Hint: To find the value of x when p = 10, solve the equation 
for x when p = 10.
?
Increasing at the rate of __________ ten packs/wk.
Fill in the blank(s) with the appropriate word(s).
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Find the derivative of y with respect to x.y = sec-1 
A. 
B. 
C. 
D. 
Answer the following statement(s) true (T) or false (F)
When the goal of a lesson is to have students understand the processes of mathematical problem solving, withholding calculators could result in students becoming bogged down in computations.
Add or subtract. Simplify by collecting like radical terms, if possible.4x
- x
+ 4y
A. (4x2y - x2 + 4xy2 )
B. (4x - x2 + 4y2 )
C. (4xy2 - x3 + 4y3 )
D. (4xy - x2 + 4y2 )
Refer to the graph of the linear functions 
and 
to solve the inequality. Write the solution set in set-builder notation.
y1 ? y2
A. 
B. 
C. ?
D. All real numbers