Please help as soon as possible

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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

If f(x)=3 over x+2 - square root x-3 then f(7)=