Need help plz .

A) x=10

Step-by-step explanation:

All the angles in a triangle will add to equal 180°.

Knowing this, we can set up an equation.

(8x+5) + (5x-1) + (4x+6)= 180°

In order to solve, we must first combine like terms. (These can be found on the left side of the equation).

8x+5x+4x= 17x

5+ (-1) + 6= 10

We can now rewrite our equation as follows:

17x+10=180°

Subtract 10 from both sides.

17x+10=180°

    - 10   -10

17x=170°

Divide by 17 on both sides.

17x=170°

17      17

x= 10°

The answer is x=10°.

Solution:-

As we know sum of interior angles of triangle is equal to 180°

Therefore:

Angle A + Angle B + Angle C = 180°

(8x + 5)° + (5x - 1)° + (5x + 6)° = 180°

8x + 5° + 5x - 1° + 5x + 6° =180°

8x + 5x + 5x = 180° -5° + 1° - 6°

8x + 10x= 181° - 11°

18x = 170°

x = 170/18

x = 9.44

x = 10 (approx)

I.e Option A I.e 10 is correct

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step-by-step explanation: