Answer B is correct. She forgot to use a variable for 1.49. The correct equasion would be:
If a = b then a + b = c is
2a = c
OR
2b = c
This is the quadratic formula.
The answer is: 12 centimeters.
The explanation is shown below:
1. By definition, all four sides of the square are equal and the diagonals are equal too.
2. Keeping the information above on mind, you know that AC and BD are equal:

3. Then, the length of BD is twice BE. So, you can calculate it as following:


4. Therefore, the lenght of AC is:
