Answer:
Part A: 30 + 9x
Part B: 48
Explanation:
Part A:
18 + 5x + 4(x + 3)
Use distributive property
18 + 5x + 4x + 12
Combine like terms
30 + 9x
Part B:
x = 2
30 + 9(2)
Use PEMDAS
30 + 18
48
Perimeter:
18+4x+12+5x
=30+9x
30+9(2)
=30+18
=48
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