Given e = i × r and p = e × i, select the formula that will solve for e when only r and p are known. select one:

E =IR

P = EI

solve for I by dividing both sides by E

P/E = I

E = IR

substitute for I

E = (P/E) *R

Multiply both sides by E

E^2 = RP

take the square root of each side

E= sqrt (PR)

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