Alinear function can be used to model the decrease in rainfall measured since 1880. the decrease in annual rainfall has been constant .12 inches per year. let x represent the number of years since 1880 when measurements began and let y represent the annual rainfall.

It is 2 out of 8 she will pick green and 3 out of 7 she will pick green but red and green would be 5 out of 5 so 50% chance

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.