If the measure of base angle abc is 75°, what is m∠bac?

An isosceles triangle has two sides of equal length and two equal angles.

Triangle =180°

180= 75° + 75° + x
180= 150 + x
Subtract 150 from both sides
30° = x

Angle BAC is B) 30°

Hope this helps! :)

Do you need with the x value for the minimum? its always between the two intercepts for a parabola