How do you know if an expression is describing a percent increase or a percent decrease?

Can someone me with these two circle theorem questions asap?

Select the correct answer. employee earnings per month($) 1 1,200 2 2,600 3 1,800 4 1,450 5 3,500 6 2,800 7 12,500 8 3,200 which measure of spread is best for the data in the table? a. range b. quartiles c. interquartile range d. mean absolute deviation

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)