You add the 4 to both sides of the equation.
Use pemdas : so do parenthesis first 15-8, then multiply the answer by 6. OR u can use distributive property & multiply 6 by 15 & 8
There are no real roots for a negative number, so -81 has no real roots, if the number is 81 however, then the tow roots are 9
After arranging the data from least to greatest:
Q1: 12.5
Q3: 16
IQR ( Q3-Q1) : 3.5
