Question

Urgent please help. Will mark brainliest

Answer 1

Answer:

$x=29$

Step-by-step explanation:

Given:

For Δ ABC

m∠A=$(3x+8)$°

m∠B=$(2x+7)$°

m∠C=$(x-9)$°

To find value of $x$.

Solution:

For all triangles the sum of all 3 angles = 180°

Thus, we have:

$m\angle A+m\angle B+m\angle C=180\°$

Plugging the values in degrees.

$3x+8+2x+7+x-9=180$

Combining like terms.

$3x+2x+x+8+7-9=180$

$6x+6=180$

Subtracting both sides by 6.

$6x+6-6=180-6$

$6x=174$

Dividing both sides by 6.

$\frac{6x}{6}=\frac{174}{6}$

∴ $x=29$ (Answer)