I need help forming an equation

21=1/2n+5

There were 32 volunteers on the first day

Step-by-step explanation:

number of volunteers on the first day=n

21=number of volunteers on the second day

21=1/2n+5

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)