Plz help I have a timed test on Edgenuity. Will mark brainliest to whoever answers correctly. Which equation can be used to find the measure of A?? Triangle ABC is isosceles
A. 118= x+ x
B. x + x+ 18= 180
118+ 180= x+x
(x+x)-118= 180

x+x°+118° = 180°; x = 31°  (B)

Step-by-step explanation:

∠A+∠B+∠C = 180°

∠A = 180°-(∠B+∠C)

Substituting the values of each angle in the expression to get ∠A we have;

∠A = 180°- (118°+x°)

Since ∠A = x

x = 180°- (118°+x°)

x = 180°-118°-x°

x+x°+118° = 180° (This gives the required equation)

To get x;

2x° + 118° = 180°

Subtracting 118° from both sides

2x° + 118°-118° = 180°-118°

2x°= 62°

x = 31°

2x^2+5x+17

your welcome. : )