
Used:

Functions have the same derivatives if they differ a constant.
h(x) = f(x); g(x) = f(x) + const.
h'(x) = f'(x)
g'(x) = (f(x) + const.)' = f'(x) + (const.)' = f'(x) + 0 = f'(x)
h'(x) = g'(x)
Therefore yuor answer is A. f'(x)=g'(x)

Used:

Multiply everything in the parenthesis by 3.
9x - 24 = 4x + 6
Add 24 to both sides.
9x = 4x + 30
Subtract 4x from both sides.
5x = 30
Divide both sides by 5.
x = 6
Hope this helps!
The value is 21 Because three represents those to variables which both equal to 21.
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➷ x + y = 66
y - x = 22 (rearrange for y)
y = x - 22 (substitute this into the top equation)
x + (x - 22) = 66
2x - 22 = 66
Add 22 to both sides
2x = 88
x = 44
The two numbers are 44 and 22
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