Solve the rational equation.
= 
A. -3
B. 3
C. 1
D. -1
Answer: C
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Use the Chain Rule or implicit differentiation to find the indicated derivative.y2 cos x + x2 sin y = 0. Find 
.
A. 
B. 
C. 
D. 
If possible, solve each system by an algebraic method (substitution or addition method). Otherwise, state that the problem has no solution or an infinite number of solutions.9x - 4y = 47-0.5x + 0.3y = -2.3
A. (4, 7) B. (7, 4) C. (7, 5) D. (6, 5)
Solve the problem.The strength S of a rectangular wooden beam is proportional to its width times the square of its depth. Find the dimensions of the strongest beam that can be cut from a 
cylindrical log. (Round answers to the nearest tenth.)
A. w = 6.4 in.; d = 9.0 in. B. w = 7.4 in.; d = 10.0 in. C. w = 5.4 in.; d = 10.0 in. D. w = 7.4 in.; d = 8.0 in.
Use a calculator to find the function value to four decimal places.cos (57.6°)
A. 1.5757 B. 0.4964 C. 0.5358 D. 0.8443