Quadratic Inequality Application
The function U(t)=0.338t2+1.807t+6.545\displaystyle {U}{\left({t}\right)}=-{0.338}{t}^{{2}}+{1.807}{t}+{6.545} models the annual unemployment percentage rate for the Phoenix-Mesa-Scottsdale area from the beginning of 2008 through the end of 2014, where t\displaystyle {t} represents the number of years since 2008.
a) Use a graphing method to determine the years in which the unemployment rate was greater that 8.5%

Write your answer in interval notation rounding to one decimal place.

Complete the following sentence using the information from your graph.

The unemployment rate was above 8.5% starting in year and ending in the year
b) Use a graphing method to determine the years in which the unemployment rate was less than 7%

Write your answer in interval notation rounding to one decimal place.

Complete the following sentence using the information from your graph.

The unemployment rate was below 7% starting in year and ending in the year as well as starting in the year and ending in the year