Respuesta :

If you multiply a certain number by 2.5, add 1.7 the expression is as follows:

2.5x + 1.7

Variables:

Variables are letters use to represent numbers in a mathematical expression.

Therefore,

let the certain number = x

The certain number is multiplied by 2.5.Therefore,

  • 2.5 × x = 2.5x

Then , we add 1.7 to the product of 2.5 and x. Therefore,

  • 2.5x + 1.7

The final expression is as follows:

  • 2.5x + 1.7

learn more on algebraic expression here: https://brainly.com/question/25997078

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