Let's use the conditional probability formula to calculate the probability that Luis makes both free throws:
P(both free throws) = P(makes first) * P(makes second | makes first)
We are given that:
P(makes first) = 0.75
P(makes second | makes first) = 0.85
So we can substitute these values in the formula:
P(both free throws) = 0.75 * 0.85
P(both free throws) = 0.6375
Therefore, the probability that Luis makes both free throws is 0.6375, or 0.638 rounded to the nearest thousandth.