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Three times the sum of a number and seven is negative thirty-six. what is the number?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

As voters exit the polls, you ask a representative random sample of voters if they voted for a proposition. if the true percentage of voters who vote for the proposition is 63%, what is the probability that, in your sample, exactly 5 do not voted for the proposition before 2 voted for the proposition? the probability is