El valor del número A es 692.31.
<h3>
Percentage</h3>
The percentage is the given definition for a fraction whose denominator is equal to 100. It is represented by %. See the following example:

The percentage is considered a math tool with several applications and areas, for example: medicine, engineering, investments, supermarkets, drugstores,banks etc.
The exercise asks you the value of A and it gives you the value (900) that represents 130%A. Thus, you should write an equality between the division the percentage and the variable A by 100 with the value 900.
You should follow the steps below.

You can check the result : 
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Answer: due to distributive property you multiply -2 by 2x and you get -4x
-4x
Step-by-step explanation:
6h+5(h-5)= 52
Mutiply the bracket by 5
(5)(h)(5)(-5)= 5h-25
6h+5h-25= 52
move -25 to the other side
sign changes from -25 to +25
6h+5h-25+25= 52+25
6h+5h= 77
11h= 77
divide by 11
11h/11= 77/11
Cross out 11 and 11, divide by 11 and becomes 1*1*h= h
h= 7
Answer: h= 7
86-25.2 = 60.8 pounds of flour used
60.8/10 = 6.08 pounds used per day
5 (4x2) + 6 - (2x2) - 1
5 + 6 = 11, 4 x 2 = 8
2 x 2 = 4, 11 + 6 = 17
17 - 1 = 16