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48.5 cm (C).

Step-by-step explanation:

First, the area of the rectangle:

Length × width = 8 × 4 = 32cm²

Second, the area of the square:

Length × Length = 3 × 3 = 9cm²

Third area of the triangle:

To find the height:

8 - 3 = 5 cm

Base:

3 cm

½ × base × height = ½ × 3 × 5 = 15/2 = 7.5cm²

Now add all of them together:

32 + 9 + 7.5 = 48.5 cm²

48.5 cm² is the answer.

a

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!