Find the number of subsets of the set.{7, 8, 9}
A. 6
B. 3
C. 7
D. 8
Answer: D
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Find the derivative.y = 
A. 
(6x + 5)3/2
B. 
- 
C. 
D. 
Provide an appropriate response.Perform the indicated operations: -4 - 3 ÷ 1 × 
+ 50
A. -48 B. 18 C. -54 D. -16
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
Solve the problem.Suppose a cost-benefit model is given by y = 
, where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 40% to the nearest dollar.
A. $1867 B. $2800 C. $1120 D. $666