Solve.Tickets for a bluegrass music festival cost $25 for an adult, $20for seniors, $14 for students, and $9 for children under 12. The bluegrass society in the town of Puddington is providing a bus to take a group to the festival. Use the following table to find the total cost of the tickets for this group. The first row has been filled in for you. PersonNumber of PersonsCost per PersonCost per CategoryAdult10?$25$250Senior6?$20?Student21?$14?Child under 127?$9?
A. $68
B. $734
C. $727
D. $712
Answer: C
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Solve the problem.An honest coin is tossed n times. Let the random variable X denote the number of heads tossed. How many tosses n are required to be 97.5% certain that X will be less than 
+ 20?
A. 100 B. 400 C. 800 D. 200 E. none of these
Solve the problem.If a spring stretches 0.4 meter when a 6-kilogram weight is attached to it, how much will it stretch when a 21-kilogram weight is attached to it?
A. 0.4 m B. 1.4 m C. 4.4 m D. 3.4 m
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
Use an appropriate identity to find the exact value of the expression.cos (285°)
A. - 
B. - 
(
+ 1)
C. - 
(
- 1)
D. 