Xample 4
p. 344
23. economics in 2000, the demand for nurses was 2,000,000, while the supply was
only 1,890,000. the projected demand for nurses in 2010 is 2,820,000, while the
supply is only projected to be 1,810,000.
a. define the variables, and write equations to represent these situations.
b. use substitution to determine during which year the supply of nurses was
equal to the demand.

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.