Please help me and show your work/explain.

Answer:
5x+3x+20 =
8x + 20 =
8*100 + 20 =
800 + 20 =
820 ← answer
Step-by-step explanation: :)
HOPE THIS HELPS!!!
Answer:
Sam solve for x instead of substituting 100 for x
Step-by-step explanation:
5x+3x+20
5(100)+3(100)+20
500+300+20
820