Answer:
D
Step-by-step explanation:
I'm pretty sure it's D
-3x-2-6x=-4-<em>(-4x)</em>+12
-9x-2=-16x+12
7x=14
x=2.
You probably got confused with the italicized part.
Answer:

Step-by-step explanation:
1. Shifting
right or left, top or down, as the graph in the question has the same illustration of
. Consider

2. find a and b by using two sample points from the graph:
and 

Answer:
The sum of the age of pupils is 81
Step-by-step explanation:
Let sum of age of 18pupils = x
Average ages = 4.5
Average = total/no. of pupil
4.5 = x/18
x = 81
When the terms do not have the same number or the other vaue, it must be given in your maths book,chapter related to fractions