Four times the dference of a number and three is twelve find the number

the number is 6

let the number be n , then the difference of this number and 3 is n - 3

4 times this is 4(n - 3) = 12 ( solve for n )

divide both sides by 4

n - 3 = 3 ( add 3 to both sides )

n = 3 + 3 = 6

the number is 6

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

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