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.

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: