d) \( \sqrt{1-\frac{3}{5}}= \)

Let's simplify the expression step-by-step. First, calculate \( \frac{3}{5} \), which is \( 0.6 \). Then subtract that from 1: \( 1 - 0.6 = 0.4 \). Now, take the square root of \( 0.4 \). The square root of \( 0.4 \) can be approximated as \( \sqrt{0.4} \approx 0.632 \). So, the final answer is \( \sqrt{1 - \frac{3}{5}} \approx 0.632 \). But you can get really precise with this! The exact value simplifies to \( \sqrt{\frac{2}{5}} \), which is just \( \frac{\sqrt{2}}{\sqrt{5}} \). That makes it a fancy answer too!