The equation y=19(1.057)x represents book sales in billions of dollars since 1990. Let x represent the number of years. Let x = 0 represent book sales in 1990.

What were the total sales, in billions of dollars, in 2010?

Question

The equation y=19(1.057)x represents book sales in billions of dollars since 1990. Let x represent the number of years. Let x = 0 represent book sales in 1990.

What were the total sales, in billions of dollars, in 2010?

AZ · Answer

$ y = 19 (1.057)^x $

x = 0 is the book sales in 1990
and we want to calculate the book sales in 2010

so what is 2010 - 1990 = ?
that will be the x value we use to put into the formula to solve for y, the total sale in billions of dollars

so what is 2010 - 1990 =

AZ · Answer

Once you find that number, just take a calculator and do 1.057^(that number)

and then multiply by 19

and that will give you the total sales in 2010