Consider the graph.
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The amount of fiber needed in a day is 7.98 grams
<h3>Proportions</h3>Proportions are parts, in comparative relation to a whole.
In other words, proportions are fractions of a larger dataset
The given parameters from the question are given as:
- Proportion of the daily value of fiber needed = 57%
- Daily serving = 14 grams.
The amount of fiber needed in a day is the product of the proportion and the size of the daily serving.
So, we have:
Hence, the amount of fiber needed in a day is 7.98 grams
Read more about proportions at:
We'll have this following figure drawn in the picture. Since we have an isosceles trapezoid, the diagonals are congruent. According to the conditions of the problem, these diagonals are perpendicular and then we can claim that we'll have right-isosceles triangles in this case. Indeed, ∠OBC = ∠FBD = 45°. Then, in the triangle BFD. BF=FD=23. It means the height is 23 cm. Obtaining this fact, we can easily calculate the area. 
