Answer:
4 and 5
Step-by-step explanation:
Let the numbers be x and y
If their sum is 9, hence;
x + y = 9 ....1
When reversed
10y+x = 2(10x+y)
10y+x = 20x + 2y
10y - 2y = 20x - x
8y = 19x
y = 10x/8 ...2
Substitute equation 2 into 1;
From 1;
x+y = 9
x +(10x/8) = 9
18x/8 = 9
18x = 72
x = 72/18
x = 4
Since x+y =9
y = 9-x
y =9-4
y = 5
Hence the numbers are 4 and 5
Pandas and combine like terms
The absolute value of -81 has the same absolute value as that of 81 because they both have the same distance to 0.
Answer:

Step-by-step explanation:
Maximum Value → Parabola opens downward [<em>−A</em>]
Minimum Value → Parabola opens upward [<em>A</em>]
<em>See graph above</em>
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