You can make 4 skateboards because 1/4 is equal to 0.25 so therefore 32.25 is how big each section would be so in order to get the number of skate boards you divide 129 by 32.25 and that gets you the answer of 4
Using a Laplace expansion along the first column, we have

The determinant of a 2x2 matrix is trivial,

So we have

Answer:
SA = 3.04m²
Step-by-step explanation:
SA = 2 x ( Length x Width + Width x Height + Length x Height )
SA = 2 x ( 0.4 x 1 + 0.4 x 0.8 + 1 x 0.8 )
SA = 2 x ( 0.4 + 0.32 +0.8)
SA = 2 x 1.52
SA = 3.04 m²
I wish this could help you !
The segment inside the large triangle is B: Altitude.