15. a grocery display of cans is arranged in the form of a pyramid 1 canin the top row, 3 in the second row from the top, 5 in the third row, and7 in the fourth row. the total number of cans c equals 2 times the row rminus 1. use the equation c=2r-1 to complete the tablecans.

on number 15?

When we put 
5th row in equation we get c=2x5-1
                                             =>c=10-1
                                             =>c=9
in each row can s + by 2

The answer is C, 7.5.

This is because you know that these are the same objects, since it’s asking to find the scale factor. You are able to correlate AB to EF, and that shows a scale UP of 1.5, from 2 to 3. With this scale factor of 1.5, we know that EH will be 1.5 times bigger than AD. So 1.5 x 5 is equal to 7.5.