Custom number is 42.4

n approximate equation for the efficiency E (in percent) of an engine is:

.instructure.com/equation_images/E%253D%255C%253A100%255C%253A%255Ccdot%255Cleft%25281%255C%253A-%255C%253A%255Cfrac%257B1%257D%257B%255Csqrt%255B5%255D%257BR%255E2%257D%257D%255Cright%2529″ alt=”E=/:100/:/cdot/left(1/:-/:/frac{1}{/sqrt[5]{R^2}}/right)”>$E=100?\left(1?\frac{1}{\sqrt[5]{R^2}}\right)$

where R is the compression ratio. Find R if E=4[a].[e][d]. Round the answer to two decimal places.

Note: if [a]=2, [e]=1, and [d]=3, then 4[a].[e][d]=42.13

Work this custom problem about the exponential and logarithmic functions using the techniques you learned in this module.

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