Why is the zero of a function the same as the x-intercept of the functiom?

The zero of a function is the x-value that makes the function say f(x)=0. The zero function is the same as x-intercept because it shown the point where the y=0 is zero and by definition the points where y is 0 is called an x-intercept.  

The sum of each of the angles in a triangle always equals 180. We are given angles A and C so all we need to do is add them together and subtract from 180 to find the missing angle.

Angle C is 34
Angle A is 90 (that little box indicates 90)
34+90=124
180-124=56

Ange B is 56 degrees.

Hope this helps!!