we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Factor the leading coefficient
----------> the value of A is 
Complete the square. Remember to balance the equation by adding the same constants to each side


Rewrite as perfect squares


therefore
the answer is
the value of A is 
Answer:
P = 4/9
Step-by-step explanation:
Event A1: The first dice shows a factor of 12. P(A1) = 4/6 = 2/3
Event A2: The second dice shows a factor of 12. P(A2) = 4/6 = 2/3
P (A1*A2)=4/9
<span>If the range of the answer should be +/- 10% of the particular value, then you have to solve for the percentage of that particular value. Since the value given is 1.8, we thus want to find 10% of that:
1.8 * 10/100 = 0.18
Then, add this value to the original value of 1.8:
1.8+0.18 = 1.98
Next, subtract .18 from from the original value of 1.8:
1.8-0.18 = 1.62
The range will be between these two numbers, so the range is from 1.62 to 1.98.</span>
4 since 64/8=8 there are 8 rows and if 4 are filled with tenors the rest must be filled with sopranos