silasbrewer silasbrewer

18-08-2022
Mathematics

contestada

Twice a number, increased by three, is between negative one and eleven

Respuesta :

profarouk profarouk

18-08-2022

Answer:

-2 ≤ x ≤ 4

Step-by-step explanation:

solving the double inequality :

-1 ≤ 2x + 3 ≤ 11

⇔ -1 - 3 ≤ 2x ≤ 11 - 3

⇔ -4 ≤ 2x ≤ 8

⇔ -4/2 ≤ 2x/2 ≤ 8/2

⇔ -2 ≤ x ≤ 4

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