To calculate the sales tax, you can use the formula:
\[ \text{Sales Tax} = \text{Price} \times \text{Sales Tax Rate} \]
In this case, the price of the bicycle is $69 and the sales tax rate is 10% (or 0.10 in decimal form).
\[ \text{Sales Tax} = 69 \times 0.10 = 6.90 \]
Roxanne will pay $6.90 in sales tax for the bicycle.