The following information is known about a loan time equals 7 years interest rate equals 6% interest equals $840 what was the principal on the loan

Answers4.) -1/205.) -1/406.) -55/127.) -3/4

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.