Answer:
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Step-by-step explanation:
Answer:
A
Step-by-step explanation:
Area of a triangle = 
where b = base length and h = height
the triangle shown has a base length of 2 and 1/2 and a height 4. and 2/5
So area =

5.5 also = 
Hence, the correct answer is A
(x+3) (x-3)
Multiply the brackets together
x*x-3*x+3*x+3*-3
x^2-3x+3x-9
x^2-9
Answer : x^2-9