What are the formulas provided at the end of the text for calculating EMF and internal resistance?

Formulas for Calculation:

• EMF (ε): ε = ε<0xE2><0x82><0x98> ± Δε, ε = ... %
• Internal Resistance (r): r = r<0xE2><0x82><0x98> ± Δr, ε<0xE1><0xB5><0xA3> = ... %