w + 6 for w = 11

17 − 2c for c = 7

\(\text{b}^{2} − 4\) for b = 5

\((\text{h} − 3)^{2}\) for h = 5

m + 2m + 3 for m = 12

\(4\times(21 − 3\text{h})\) for h = 5

7m − 9n for m = 7 and n = 5

\(\text{d}^{2} − 9\text{k} + 3\) for d = 10 and k = 9

\(3\text{x} + 4\text{y}\div2\) for x = 7 and y = 10

The formula \(\text{P} = 2\text{l} + 2\text{w}\) gives the perimeter P of a rectangular room with length l and width w. A rectangular living room is 26 feet long and 21 feet wide. What is the perimeter of the room?

The formula \(\text{C} = 5(\text{F} − 32)\div9\) gives the Celsius temperature in C degrees for a Fahrenheit temperature of F degrees. What is the Celsius temperature for a Fahrenheit temperature of 122 degrees?

Explain how the terms variable, algebraic expression, and evaluate are related.