3. Michel invests $850 at 7%/a simple interest. How long will he have to leave his investment in the bank before earning $200 in interest

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.

The x intercept is 2 and the x intercept is .5 is a