To predict the total cost for buying 10 of marker type A, we first need to determine the equation for the line A based on the points given.
The line A passes through the coordinates (0, 0) and (3, 6). We can find the slope of line A:
\[ \text{slope} = \frac{y_2 - y_1}{x_2 - x_1} = \frac{6 - 0}{3 - 0} = \frac{6}{3} = 2 \]
Since the line passes through the origin (0, 0), the equation of line A can be written as:
\[ y = 2x \]
Here, \( y \) is the total cost in dollars and \( x \) is the number of markers.
To find the cost for buying 10 markers, we substitute \( x = 10 \) into the equation:
\[ y = 2(10) = 20 \]
Thus, the total cost for buying 10 of type A markers would be $20.00.
So the answer is: $20.00.