Its 8 because your not adding your subtracting.
Answer:

Step-by-step explanation:
Given



Find the length of HG
First, it should be noted that the displayed figure is a trapezium
<em>The area of a trapezium is calculated by multiplying the sum of parallel sides by half its height;</em>
In this case;

Substitute the values of Area, HE and EF


Divide both sides by 4


Subtract 12 from both sides



<em>Hence, the length of HG is 5mm</em>
The answer is 1. sin x function oscillates propagating in the x direction with its maximum and minimum at y=1 and y=-1
Answer: I think it’s (4,0)
Step-by-step explanation: because it says (0,0) is the center point, you’d rotate by 180 degrees and move it down 3 in order for (0,0) to indeed be the center
Answer:
x=30
Step-by-step explanation:
that's a 90º angle so 90÷3=30