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10-09-2020
Mathematics

contestada

1. Evaluate 7m + 3mn; when m=8 and n=14?

2. Simplify: 675 ÷ (6+9 ÷ 3)

3. (3x - 2)(4x +1)

Respuesta :

10-09-2020

Answer:

1. 392

2. 75

3. [tex]12x^{2} - 5x -2[/tex]

Step-by-step explanation:

1. 7×8 + 3×8×14 = 56 + 336 = 392

2. 675 ÷ (6 + 3) = 675 ÷ 9 = 75

3. [tex]12[/tex][tex]x^{2}[/tex] + [tex]3x -[/tex] [tex]8x - 2[/tex] = [tex]12x^{2} -5x-2[/tex]

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