Sea ice in the Arctic ocean increases and decreases annually. Declines have even made it possible for shipping to occur through the "Northwest Passage"in recent summer seasons. The following data, shown in Table 8.10, were obtained from the NASA Earth Observatory website and represent the maximum and minimum sea ice extent, measured in September (minimum) and March (maximum) of the following year. The first line in the table is the average for the previous 20 years. (a) Plot both the September values and March values vs. the year, and add a line representing the average ice extent for 1979 - 2000. (b) Use the find command to determine which years exceeded the average September values for 1979 - 2000. (c) Use the find command to determine which years were lower than the average February values for 1979 - 2000. (d) Since the extent of Arctic sea ice has continually decreased from the previous 20 year average, a more interesting calculation would be to find the average sea ice extent over the years from 1999 to 2012. Repeat parts (b) and (c) using this new average.

$$\begin{matrix} \text{Table 8.9 Antarctic Sea lce Extent}\\ \text{Year} & \text{September average extent millions of square kilometers} & \text{March average extent millions of square kilometers}\\ \text{1979-2000 mean} & \text{7.0} & \text{15.7}\\ \text{1999/2000} & \text{6.2} & \text{15.3}\\ \text{2000/2001} & \text{6.3} & \text{15.6}\\ \text{2001/2002} & \text{6.8} & \text{15.4}\\ \text{2002/2003} & \text{6.0} & \text{15.5}\\ \text{2003/2004} & \text{6.2} & \text{15.1}\\ \text{2004/2005} & \text{6.1} & \text{14.7}\\ \text{2005/2006} & \text{5.6} & \text{14.4}\\ \text{2006/2007} & \text{5.9} & \text{14.7}\\ \text{2007/2008} & \text{4.3} & \text{15.2}\\ \text{2008/2009} & \text{4.7} & \text{15.2}\\ \text{2009/2010} & \text{5.4} & \text{15.1}\\ \text{2010/2011} & \text{4.9} & \text{14.6}\\ \text{2011/2012} & \text{4.6} & \text{15.2}\\ \text{2012/2013} & \text{3.6} & \text{15.0}\\ \end{matrix}$$

Draw a line. Then construct a line with the given property. a. perpendicular to the given line b. parallel to the given line

Hongo writes in "The Legend" that the unnamed man "negotiates the slick of ice on the sidewalk by his car." Negotiates here means -

A attempts to settle a dispute

B makes arrangements

C manages to cross

D transfers or sells

Label each of the following as either a physical process or a chemical process:

(a) rusting of an iron bridge,

(b) melting of ice,

(c) burning of a wooden stick,

(d) digestion of a baked potato,

(e) dissolving of sugar in water

If line l is perpendicular to line m and line n is parallel to line m, describe the relationship between lines l and n.

If a line, line segment, or ray is perpendicular to a plane, it is perpendicular to every line, line segment, or ray in the plane that intersects it.

a. If a line is perpendicular to each of two intersecting lines at their point of intersection, then the line is perpendicular to the plane determined by them. If line a is perpendicular to line I!. and line m at point X, what must also be true?

b. If a line is perpendicular to a plane, then any line perpendicular to the given line at the point of intersection with the given plane is in the given plane. If line a is perpendicular to plane P and line m and point X, what must also be true?

c. If a line is perpendicular to a plane, then every plane containing the line is perpendicular to the given plane. If line a is perpendicular to plane P, what must also be true?

Find the syntax errors in the following class definition. (1, 2, 5)

class mystery                    // Line 1
{                                // Line 2
     public;                     // Line 3
     void print() const;         // Line 4
     void setXY(double, double); // Line 5
     int add();                  // Line 6
     double mystery();           // Line 7
private:                         // Line 8
     double x;                   // Line 9
     double y;                   // Line 10
};                               // Line 11

Find the error(s) in the following code:

class discover                                          //Line 1
{                                                       //Line 2
friend double operator+(const discover&,
                            const discover&);           //Line 3
public:                                                 //Line 4
    discover();                                         //Line 5
    discover(double, double);                           //Line 6
private:                                                //Line 7
    double first;                                       //Line 8
    double second;                                      //Line 9
};   
//Line 10
double discover::operator+(const discover& a,
                    const discover& b)                  //Line 11
{                                                       //Line 12
    discover temp;
    temp.first = a.first + b.first;                     //Line 13
    temp.second = a.second + b.second;                  //Line 14
    return temp;                                        //Line 15
}                                                       //Line 16

Which sample contains more molecules, 15.0 L of steam (gaseous H$_2$O) at 123.0 degree celcius and 0.93 atm pressure or a 10.5 g ice cube at -5.0 degree celcius?

Given the equation of the line and pint P not on the line, find the equation of a line parallel to the given line and a line perpendicular to the given line through the given point. y=-2x-5, P(-1, 4)

What is wrong with the following program?

#include <iostream>                                        //Line 1
#include <strings>                                         //Line 2

int main()                                                 //Line 3
{                                                          //Line 4
    string str;                                            //Line 5
    std::cin >> str;                                       //Line 6
    cout << str << endl;                                   //Line 7
    return 0;                                              //Line 8
}                                                          //Line 9

Calculate q when 0.10 g of ice is cooled from $10 . ^ { \circ } \mathrm { C }$ to $- 75 ^ { \circ } \mathrm { C } ( \mathrm { cice } = 2.087 \mathrm { J } / \mathrm { g } \cdot \mathrm { K } )$

Consider the following C++ code:

int numOfItems; //Line 1
double unitCost; //Line 2
cout << fixed << showpoint << setprecision(2); //Line 3
try //Line 4
{ //Line 5
    cout << "Enter the number of items: "; //Line 6
    cin >> numOfItems; //Line 7
    cout << endl; //Line 8
    if (numOfItems < 0) //Line 9
        throw numOfItems; //Line 10
    cout << "Enter the cost of one item: "; //Line 11
    cin >> unitCost; //Line 12
    cout << endl; //Line 13
    if (unitCost < 0) //Line 14
        throw unitCost; //Line 15
    cout << "Total cost: $" <<
        numOfItems * unitCost << endl; //Line 16
} //Line 17
catch (int num) //Line 18
{ //Line 19
    cout << "Negative number of items: " << num <<
        endl; //Line 20
    cout << "Numer of items must be nonnegative." <<
        endl; //Line 21
} //Line 22
catch (double dec) //Line 23
{ //Line 24
    cout << "Negative unit cost: " << dec <<
        endl; //Line 25
    cout << "Unit cost must be nonnegative." <<
        endl; //Line 26
} //Line 28

• In this code, identify the try block.

Find the error(s) in the following code:

class discover                                  // Line 1
{                                               // Line 2
    friend double operator+(const discover &,
                            const discover &);  // Line 3
public:                                         // Line 4
    discover();                                 // Line 5
    discover(double, double);                   // Line 6
private:                                        // Line 7
    double first;                               // Line 8
    double second;                              // Line 9
};                                              // Line 10
double discover::operator+(const discover &a,   
                           const discover &b)   // Line 11
{                                               // Line 12
    discover temp;
    temp.first = a.first + b.first;             // Line 13
    temp.second = a.second + b.second;          // Line 14
    return temp;                                // Line 15
}                                               // Line 16