Question

interior and exterior triangle angles
question
in $\triangle klm$, $m\angle k = (x + 13)\degree$,
$m\angle l = (7x - 7)\degree$, and
$m\angle m = (4x - 18)\degree$. what is the value of
$x$?
answer
attempt 1 out of 2
$x = \square$ submit answer

Explanation:

Step1: Sum interior angles to 180°

$(x+13) + (7x-7) + (4x-18) = 180$

Step2: Combine like terms

$x+7x+4x +13-7-18 = 180$
$12x -12 = 180$

Step3: Isolate the variable term

$12x = 180 + 12$
$12x = 192$

Step4: Solve for x

$x = \frac{192}{12}$

Answer:

$16$