Answer:
2x+9=12x-21
-2. -2
9=10x -21
+21 +21
30=10x
Divide by 10 on both sides
30/10
x=3
Step-by-step explanation:
Answer:

Step-by-step explanation:
- Height of cone (h) = 7 cm
- Formula for Volume of cone is given as:
- Plugging the values of h and r in the above formula, we find:
Answer:
Step-by-step explanation:
100
Answer:
The first 3
Step-by-step explanation:
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Answer:
69
Step-by-step explanation:
23 on each shelf x 3 shelves = 69 books