Answer:
(a) 2(x -a)
(b) 4x +2h
Step-by-step explanation:
Fill in the function arguments and simplify.
a.

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b.

Assuming that only one choice of music can be made then the question is simple.
20 + 40 = 60 students
1 yard = 3 feet
1 foot = 12 inches
So: 6 * 3 = 18 feet
And: 18 * 12 = 216 inches
Hope this helps. :)