Evaluate for the given values of the variables.
#17. 8 + 3n for n = 6
#18. (8 + 3) n for n = 6
#19. 90 - 4d for d = 3
#20. 7x + 2y for x = 15, y = 20
#21. sbt. for a = 2. b = 4
#22. 2 + 5x second power. for x = 4
#23. 2 + (5x) second power. for x = 4
#24. (2 + 5x) second power. for x = 4
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