Step 1: Click on "Next"

Step 2: Find L₁, L₂, L₃ and L₄

then click on "Verify"

Step 3: Find X₁L₁, X₂L₂, X₃L₃ and X₄L₄

then click on "Verify"

Step 4: Calculate X

then click on "Verify"

Activity 2

Step 5: Find L₁, L₂, L₃ and L₄

then click on "Verify"

Step 6: Find X₁L₁, X₂L₂, X₃L₃ and X₄L₄

then click on "Verify"

Step 7: Calculate X

then click on "Verify" and then on "Next"

Experiment completed.