Write an inequality to represent the model and solve for the unknown number
let
the unknown number = x
twice a number = 2 × x
= 2x
Three more than twice a number = 2x + 3
Three more than twice a number is greater than negative fifteen:
2x + 3 > -15
2x > -15 - 3
2x > - 18
Divide both sides by 2
x > -18/2
x > -9
Therefore, the unknown number x, is greater than -9
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