it's the only one that hasn't been with a positive 2
A variable is a letter, for example x, y or z, that represents an unspecified number.
6 + x = 12
To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12.
Answer:
The answer is (2,1)
Step-by-step explanation:
C. -10
(20+2x)/(5-x)
Multiply both sides by lowest common denominator, simplify

2x + 20 = 0
2(x + 10) = 0
factor out 2 from 2x+20
Since the diameter of the circle is 6 inches, then the radius will be half that, or 3 inches,