Find the value of df-1/dx at x = f(a).f(x) = x3 - 3x2 - 6, x ? 2, a = 6
A. - 
B. 72
C. 
D. 
Answer: D
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Solve the problem.The hypotenuse of a right triangle is 9 feet long. One leg of the triangle is 3 feet longer then the other leg. Find the perimeter of the triangle.
A. 
ft
B. 
ft
C. (3
+ 9) ft
D. (3
- 9) ft
Perform the indicated operation. Express your answer in simplest form.
+ 
A. 
B. 
C. 
D. 
Solve the problem.A bakery sells four main items: rolls, bread, cake, and pie. The amount of each of five ingredients (in cups, except for eggs) required to make a dozen rolls, a loaf of bread, a cake, or a pie is given by matrix A. Eggs Flour Sugar Shortening Milk 
= ASuppose a day's orders total 20 dozen rolls, 200 loaves of bread, 50 cakes, and 60 pies. Write the orders as a 1 × 4 matrix and, using matrix multiplication, find a matrix for the amount of each ingredient needed to fill the day's orders.
A. 
B. These matrices cannot be multiplied.
C. 
D. 
Solve the problem.The half-life of silicon-32 is 710 years. If 90 grams is present now, how much will be present in 800 years? (Round your answer to three decimal places.)
A. 0 B. 0.037 C. 83.238 D. 41.215