Answer
1.523
Work Step by Step
We are given that Mars is 141.5 million miles from the sun. We are also told that AU is the average distance between Earth and the sun, or 92.9 million miles. Therefore, we can divide Mars' distance from the sun by 92.9 million miles in order to calculate Mars' AU from the sun.
$\frac{141.5}{92.9}=1.523$ AU from the sun