Find the value of d2y/dx2 at the point defined by the given value of t.x = t, y = 
, t = 7
A. - 
B. - 
C. - 
D. 
Answer: B
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Graph the polar equation.r = 
A. 
B. 
C. 
D. 
Convert the units.16 ft2 = 
yd2
A. 1.78 B. 192 C. 1.33 D. 144
Solve the system of equations. If the system has no solution, say that it is inconsistent.
A. x = 
, y = - 
; 
B. x = 4, y = 20; (4, 20)
C. x = 4, y = 5; (4, 5)
D. inconsistent
Solve the problem.An agricultural research scientist is developing three new crop growth supplements -- A, B, and C. Each pound of each supplement contains four enzymes -- E1, E2, E3, and E4 -- in the amounts (in milligrams) shown in the table.
The cost of E1 is $20/mg, the cost of E2 is $40/mg, the cost of E3 is $10/mg, and the cost of E4 is also $10/mg. The growth benefit for crops is expected to be proportional to 10 times the amount of A used, 25 times the amount of B used, and 60 times the amount of C used. However, the total cost of the enzymes used in A, B, and C must be less than $5000 for each treatment. How many pounds each of A, B, and C should be produced to maximize
the growth effect? A. 0 lb of A, 0 lb of B, and 15 lb of C B. 0 lb of A, 9.3 lb of B, and 10 lb of C C. 3 lb of A, 3 lb of B, and 4 lb of C D. 9 lb of A, 0 lb of B, and 9.5 lb of C