The number of music CDs sold in 2003 by one company was approximately 1.5×105. The number of music CDs sold by the same company in 2013 was approximately 7.1×107. What is the difference in CDs sold between 2003 and 2013?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Select all of the following expressions that are equal to 2.5.

Write the component forms of vectors u and v, shown in the graph, and find v − 2u. u= (< -3, -2> , < -3, -1> , < -2, -2> , < -2, -1> ) v= (< -5, 1> , -4, 0> , < 0, -4> , < 1, -5> ) v-2u= (< 5, 3> , < 0, 4> , < 4, 0> , < 5, -3>