The function b(r)=7+4(r−1)b(r)=7+4(r−1) represents the number of bricks in row r of a structure.

what does the value 7 represent in this situation?

there are 7 bricks in the first row of the structure.

the structure contains 7 rows of bricks.

a given row of bricks contains 7 more bricks than the previous row.

every row contains exactly 7 bricks.

There are 7 bricks in the first row of the structure.

Step-by-step explanation:

Given function: which represents the number of bricks in row r of a structure.

If we put r=1, we get the number of bricks in first row.

Therefore, There are 7 bricks in the first row of the structure.

Thus, the value of 7 represents that there are 7 bricks in the first row of the structure.

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.