Mrs. Smith operates a business in a competitive market.  The current market price is $8.10.  At her profit-maximizing level of production, the average variable cost is $8.00, and the average total cost is $8.25.  Mrs. Smith should:                             

Many sports cars are convertibles. The air flow over such a car is significantly different depending on whether the convertible top is up or down. The engine of the 1000-kg car delivers 135 kW to the wheels, the car frontal area is 1.9 m² and rolling resistance is 2.5% of the car weight. The drag coefficient when the top is down is 0.43 and 0.31 when it is up. For 20 ºC air at one atmosphere, determine:

a. the maximum speed with the top up (in m/s)

b. the maximum speed with the top down (in m/s)

2.While stock selection is best approached from the bottom-up, ignoring the top-down can be extraordinarily expensive. The bottom-up can also inform the top-down. As Ben Graham pointed out “True bargain issues have repeatedly become scarce in bull markets (James Montier) 2.1. Differentiate between the bottom-up and top-down approach to fundamental analysis.(3) 2.2. Do you think investors should choose between the two approaches, or do you believe that they are complimentary? (3)

A car initially traveling at 40 m/s runs out of gas while traveling up a slope. It coasts for a distance of 500 m before it starts to roll back down.

a. What is the acceleration of the car?

b. What is the angle (incline) of the slope?

c. How long does it take after the car runs out of gas before it starts to roll back down?

d. Once the car starts rolling backwards, how long does it take before it passes its starting point, 500m down the slope?

A 50 kg crate slides down a ramp that is inclined by 30 degrees from the horizontal. The acceleration of the crate parallel to the surface of the ramp is 2.0m/s^2, and the length of the ramp is 10m.

Determine the kinetic energy accumulated by the crate when it reaches the bottom of the ramp if it started from rest at the top of the incline.

Calculate the amount of energy lost by the crate due to friction in its journey down the ramp.

Compute the magnitude of the frictional force that acts on the crate as it slides down the ramp and calculate the coefficient of kinetic friction between the ramp and the crate.

**java**

A bicycle combination lock has four rings with numbers 0 through 9. Given the actual numbers and the combination to unlock, print instructions to unlock the lock using the minimum number of twists. A “twist up” increases the number value of a ring, and a “twist down” decreases it. For example, if the actual number shown is 1729 and the desired combination is 5714, write your instructions like this:

Ring 1: Twist up 4 times

Ring 3: Twist down once

Ring 4: Twist up or down 5 times

Imagine Bill operates a small business that manufactures teddy bears. Assume that the market for teddy bears is perfectly competitive and the market price is $30 per teddy bear. The following table represents Bill's daily cost structure. Complete the columns: TVC, TFC, TR, Profit, MR and MC (Enter all numerical responses as whole numbers, i.e. zero decimal places)

According to the marginal approach, what is Bill's profit maximising/loss minimising quantity of teddy bears per day?

At this point, should Bill operate or shut down his business? (Type: 'operate' or 'shut down')

Suppose the market price falls to $20 per teddy bear. According to the marginal approach, what is Bill's profit maximising/loss minimising quantity of teddy bears per day?

At this point, should Bill operate or shut down his business? (Type: 'operate' or 'shut down')

Suppose the market price falls to $15 per teddy bear. According to the marginal approach, what is Bill's profit maximising/loss minimising quantity of teddy bears per day?

At this point, should Bill operate or shut down his business? (Type: 'operate' or 'shut down')

Build a Date class and a main function to test it

Specifications
Below is the interface for the Date class: it is our "contract" with you: you have to implement everything it describes, and show us that it works with a test harness that puts it through its paces. The comments in the interface below should be sufficient for you to understand the project (use these comments in your Date declaration), without the need of any further documentation.

class Date
{
 private:
   unsigned day;
   unsigned month;
   string monthName;
   unsigned year;

 public:
   // creates the date January 1st, 2000.
   Date();


   /* parameterized constructor: month number, day, year 
       - e.g. (3, 1, 2010) will construct the date March 1st, 2010

       If any of the arguments are invalid (e.g. 15 for month or 32 for day)
       then the constructor will construct instead a valid Date as close
       as possible to the arguments provided - e.g. in above example,
       Date(15, 32, 2010), the Date would be corrected to Dec 31st, 2010.
       In case of such invalid input, the constructor will issue a console error message: 

       Invalid date values: Date corrected to 12/31/2010.
       (with a newline at the end).
   */
   Date(unsigned m, unsigned d, unsigned y);


   /* parameterized constructor: month name, day, year
 ­      - e.g. (December, 15, 2012) will construct the date December 15th, 2012

       If the constructor is unable to recognize the string argument as a valid month name,
       then it will issue a console error message: 

       Invalid month name: the Date was set to 1/1/2000.
       (with a newline at the end).

       If the day argument is invalid for the given month (but the month name was valid),
       then the constructor will handle this error in the same manner as the other
       parameterized constructor. 

       This constructor will recognize both "december" and "December"
       as month name.
   */
   Date(const string &mn, unsigned d, unsigned y);


   /* Outputs to the console (cout) a Date exactly in the format "3/1/2012". 
      Does not output a newline at the end.
   */
   void printNumeric() const;


   /* Outputs to the console (cout) a Date exactly in the format "March 1, 2012".
      The first letter of the month name is upper case, and the month name is
      printed in full - January, not Jan, jan, or january. 
      Does not output a newline at the end.
   */
   void printAlpha() const;

 private:

   /* Returns true if the year passed in is a leap year, otherwise returns false.
   */
   bool isLeap(unsigned y) const;


   /* Returns number of days allowed in a given month
      -  e.g. daysPerMonth(9, 2000) returns 30.
      Calculates February's days for leap and non-­leap years,
      thus, the reason year is also a parameter.
   */
   unsigned daysPerMonth(unsigned m, unsigned y) const;

   /* Returns the name of a given month
      - e.g. name(12) returns the string "December"
   */
   string name(unsigned m) const;

   /* Returns the number of a given named month
      - e.g. number("March") returns 3
   */
   unsigned number(const string &mn) const;
};

Private Member Functions

The functions declared private above, isLeap, daysPerMonth, name, number, are helper functions - member functions that will never be needed by a user of the class, and so do not belong to the public interface (which is why they are "private"). They are, however, needed by the interface functions (public member functions), which use them to test the validity of arguments and construct valid dates. For example, the constructor that passes in the month as a string will call the number function to assign a value to the unsigned member variable month.

isLeap: The rule for whether a year is a leap year is:

(year % 4 == 0) implies leap year

except (year % 100 == 0) implies NOT leap year

except (year % 400 == 0) implies leap year

So, for instance, year 2000 is a leap year, but 1900 is NOT a leap year. Years 2004, 2008, 2012, 2016, etc. are all leap years. Years 2005, 2006, 2007, 2009, 2010, etc. are NOT leap years.

Output Specifications

Read the specifications for the print function carefully. The only cout statements within your Date member functions should be:

1. the "Invalid Date" warnings in the constructors

2. in your two print functions

Required main function to be used:

Date getDate();

int main() {

   Date testDate;
   testDate = getDate();
   cout << endl;
   cout << "Numeric: ";
   testDate.printNumeric();
   cout << endl;
   cout << "Alpha:   ";
   testDate.printAlpha();
   cout << endl;

   return 0;
}

Date getDate() {
   int choice;
   unsigned monthNumber, day, year;
   string monthName;

   cout << "Which Date constructor? (Enter 1, 2, or 3)" << endl
      << "1 - Month Number" << endl
      << "2 - Month Name" << endl
      << "3 - default" << endl;
   cin >> choice;
   cout << endl;

   if (choice == 1) {
      cout << "month number? ";
      cin >> monthNumber;
      cout << endl;
      cout << "day? ";
      cin >> day;
      cout << endl;
      cout << "year? ";
      cin >> year;
      cout << endl;
      return Date(monthNumber, day, year);
   } else if (choice == 2) {
      cout << "month name? ";
      cin >> monthName;
      cout << endl;
      cout << "day? ";
      cin >> day;
      cout << endl;
      cout << "year? ";
      cin >> year;
      cout << endl;
      return Date(monthName, day, year);
   } else {
      return Date();
   }
}

What impact do lower fuel cost and other changes have on airlines net income? American Airlines group ( AAL ), the world's biggest Airline, has been reporting record profits in recent quarters. United Continental Holdings and Southwest Airlines also reported record profits. Part of what has contributed to the record it profits has been the decline in the cost of oil. the price of oil has fallen during 2014; we are spending much less at the gas pump to fill out cars. The airlines are also experiencing the effects of low oil prices; the price of jet fuel is down 18% since August 2014. Increased revenues have also contributed to the high profits in the airline industry. Overall, Airfares are up 3% for 2014. according to airlines for America, an Industry trade group. In addition, planes have been about 85% full in 2014, which is a record high for the airline industry. On the other hand, Airline spent more on fuel in 2014 than in 2010. Airlines also spent more on labor due to higher renegotiated labor contracts. Questions: A. what each of the following changes Increase or Decrease an Airlines net income (consider each item independently)? B. What income statement account would be impacted by each item? 1. The 3% increase in airfare (ticket prices). 2. The 18% decrease in the price of per gallon of jet fuel. 3. The increase in the number of seats sold. 4. The increase in the total spent on Jet fuel. 5. The increase in the cost of Labor contracts. 6. Have you experienced hirer or lower ticket prices over the last 2 years? 7. What are other ways that Airlines use to increase Revenue? 8. What are other causes for decline in the revenue of airlines? What are other factors that increase or decrease expenses of Airlines?