Answer:
Coordinates of the midpoint are (-5.5, 5)
3(3a - 6b + 7c )
Step-by-step explanation:
The greatest common factor of 9, 18 and 21 is 3
Factor out 3 from each term
9a - 18b + 21c
= 3(3a - 6b + 7c) ← in factored form
1,500 balloons in 20 packages
75 x 20 = 1500
the abswer of this question is c