Determine the real solutions to the system of nonlinear equations.x2 + y2 = 90x2 - y2 = -72
A. (3, -9), (3, 9)
B. (3, 9), (9, 3), (-3, -9), (-9, -3)
C. (3, 9), (-3, 9), (3, -9), (-3, -9)
D. (-3, -9), (-9, -3)
Answer: C
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Evaluate the integral.
A. 
B. 
C. 1225
D. 
Determine whether function is one-to-one.{(12, -12), (-9, -1), (-15, 6)}
A. Yes B. No
Determine the phase shift of the function.y = -4 cos 
A. 
B. -4
C. ?
D. - 
Solve the problem.Assume that the price per unit d of a certain item to the consumer is given by the equation 
where x is the number of units in demand. The price per unit from the supplier is given by the equation 
where x is the number of units supplied. Find the equilibrium price and the equilibrium quantity.
A. equilibrium price: $35 per unit; equilibrium quantity: 50 units B. equilibrium price: $50 per unit; equilibrium quantity: 30 units C. equilibrium price: $20 per unit; equilibrium quantity: 50 units D. equilibrium price: $30 per unit; equilibrium quantity: 50 units