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  1. a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

  2. 10.92 cm²

    Step-by-step explanation:

    The area (A) of a triangle is calculated as

    A = [tex]\frac{1}{2}[/tex] bh ( b is the base and h the perpendicular height )

    Here b= 2.8 and h = 7.8 , then

    A = [tex]\frac{1}{2}[/tex] × 2.8 × 7.8 = 1.4 × 7.8 = 10.92 cm²

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