The table below shows the projected values (in millions of dollars) of hardback college textbooks sold in the United States for the years 2007 to 2009. Year Value 2007 4412 2008 4471 2009 4556 (a) Create a system of linear equations for the data to fit the curve y = at² + bt + c, where t is the year and t = corresponds to 2007, and y is the value of the textbooks. = 4412 = 4471 = 4556 (b) Use Cramer's Rule to solve your system. a = b = C=

According to the data from public health units, Canada has begun its largest mass vaccination program in history. On the 10th day from the start of the vaccination program, there were 706 thousand vaccination doses administered. On the 17th day, there were 937 thousand vaccination doses administered. Assume that the number of vaccination doses administered keeps growing in a linear manner. a) What is the equation that gives the number of vaccination doses administered in Canada in terms of the number of days since the vaccination program started? b) What is the estimated number of vaccination doses administered by the 30th day since the vaccination program started? (Use the equation from part (a)) c) How many days since the beginning of the vaccination program will take to administer 1696 thousand vaccination doses in Canada? (Use the equation from part (a))

7 of 10 Write an equation in point-slope form for the line that passes through (2,-3) and (-5,8) Point Slope form: y - X) %3D 出 II

The Organization for Economic Cooperation and Development (OECD) consists of 20 industrialized countries. For these nations, the prediction equation relating y = child poverty rate (in percentage points) to x = social expenditure as a percentage of gross domestic product (GDP) is  = 22-1.3x. In 2000, the actual child poverty rate ranged from 2.8% (in Finland) to 21.9% (in the U.S.). Social expenditure as a percentage of GDP ranged from 2% (in the United States) to 16% (in Denmark). What is the value of the y-intercept (a) estimated in the linear prediction equation provided above (= 22-1.3x)?  Also, interpret the y-intercept.   y-intercept:     Interpretation of y-intercept: