1 if? how this equation can be written with fractional exponents and then find E for R = 5.15. An approximate equation for the efciency E (in percent) of an engine is E =100[1 ] , where R is the compression ratio. Explain How can this equation be writter with fractional exponents? By using the law of expo'ients \"43% = n m a By using the law of expo'ients n a =a By using the law of expo'ients WEWE = m n at: By using the law of expo'ients n a =a E = D (Round to two decimal places as needed.) Simplify. 6 12 + 175 -18 612 + 175 - 18 = (Type an exact answer, using radicals as needed.)