70% of the people were adults
First you subtract 1500-450 = 1050
Then you divide 1050/1500 = .7
This relation is a function. This is because no x value is repeated, so it passes the vertical line test.
Here is an example of where a relation is NOT a function:
{(2, 5), (3, –5), (2, 5), (5, –5)}
Hope this helps!
The average score for the entire year is 88.44444, so by rounding down the answer is 88%
Similar polygons only differ by a scaling factor. In other words, two polygons are similar if one is the scaled version of the other.
In particular, this implies that the angles are preserved, and the correspondent sides are in proportion.
These two polygons are both rectangles, so the angles are preserved. We must check the sides, and we have to check if the smaller sides are in the same proportion as the bigger sides.
So, the two rectangles are similar if the following is true.

In any proportion, the product of the inner terms must be the same as the product of the outer terms:

This is clearly false, and thus the two rectangles are not similar.