Answer:
23. 7x + 4y - 12 + 2x - 4y + 8
7x + 2x + 4y - 4y - 12 + 8
25. (4x + 8) - (2x - 2)
4x + 8 - 2x + 2
26. 7^9/7^13
1/7^13 - 9
28. (6x²)³
6³x²×³
30.x^8y²z^0 /x^5y^5
x^8-5 × 1 /y^5-2
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Answer:
23. 7x + 4y - 12 + 2x - 4y + 8
7x + 2x + 4y - 4y - 12 + 8
= 9x - 4 (B)
24. B
25. (4x + 8) - (2x - 2)
4x + 8 - 2x + 2
= 2x + 10 (B)
26. 7^9/7^13
1/7^13 - 9
= 1/7⁴ (C)
27. D
28. (6x²)³
6³x²×³
= 216x^6 (C)
29. B or D
30.x^8y²z^0 /x^5y^5
x^8-5 × 1 /y^5-2
= x³ /y³ (A)