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I don't understand either on of these so can someone please please please give me the answer to both, thank you so much!!!

I dont understand either on of these so can someone please please please give me the answer to both thank you so much class=

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KailaMF
i think 54 would be 10x+7 bit im not 100% sure.
hrrs01
53 is circumference to diameter, because if you do circumference/diameter you get PI.

54 is 10n + 7 because product stands for multiplication,
"a number" must be a variable, hence 10n.
"Add 7 to " can be read quite literally, 10n + 7

Correct answer is 10n + 7

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