To find the cost of traveling 70 miles using the line of best fit \( y = 0.37x + 5 \), you need to plug in \( x = 70 \) into the equation.
\[ y = 0.37(70) + 5 \]
Calculating \( 0.37 \times 70 \):
\[ 0.37 \times 70 = 25.9 \]
Now add 5:
\[ y = 25.9 + 5 = 30.9 \]
Therefore, the cost to travel 70 miles would be $30.90.