How do i find the roots of a function on the EL-531X

SOURCE: i have a el-531x how do i cauculate fractions with it

Use the key marked [a b/c]

• To enter a mixed fraction, enter integral part, press [a b/c], enter the numerator pf fraction part, press [a b/c], then enter the denominator of the fraction and press =.
  
• To enter a fraction or an improper fraction, enter numerator, press [a b/c], then the denominator and =
• If the displayed result is a mixed number , use [2nd][a b/c] to convert it in a fraction (improper fraction).
  

SOURCE: sharp advanced EL-531x how to input number after number for stats

First you have to set the calculator in STAT mode, presumably Standard Deviation or SD. The display should show a STAT annoucer to the top. To enter values use the key M+ (or the key next to which is marked DATA. The screen displays the number of data values entered so far.
To get the statistics you must use the keys marked with x bar, n, Sigma x, etc.