Answer:

Step-by-step explanation:
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Answer: b
Step-by-step explanation:
343 divided by 7 is 49
There are 49 groups of 7 in 343
The answer is 49
Assuming 5a3 equals 5a^3, and the same for everything else, you would plug in 4 for a, so 5(4)^3 - 2(4)^2 + 4 - 45, which equals 247.