How to round 23478 to the nearest 1000

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders