Simplify the expression -30 + d - 12 +6d

the answer is 7d - 42

Step-by-step explanation:

add like terms

-30 + (-12) = -42

6d + d = 7d

combine the two terms together

7d - 42(standard form) or -42 + 7d

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)