Answer:
84 cm^2
Step-by-step explanation:
The area of a triangle is
A = 1/2 bh where b is the length of the base and h is the height
A = 1/2 ( 5+9) * 12
A = 1/2 (14) * 12
A =84
y= -(1/2)x - 5
D. The system is in echelon form.
Check attachment
the answer is 2
So, where is the question that you are talking about?