A, B and C lie on a straight line. Given that angle

y

= 128° and angle

z

= 91°, work out

x

.

x = 37°

Step-by-step explanation:

The exterior angle of a triangle is equal to the sum of the 2 opposite interior angles .

y is an exterior angle of the triangle , then

y = x + z , that is

128° = x + 91° ( subtract 91° from both sides )

37° = x

x+91+(180-y)=180

180-128=52

x+91+52=180

143+x=180

x=37

Hope This Helps!!!

the circle graph is not a function.

step-by-step explanation:

the graph of the circle is not a function.

because for a graph to be a function, each value of x must give one value of y

in the circle, the values of x for -2< x< 2 each give 2 values of y.

hence this is not a function.

an altitude of 15,000 feet

step-by-step explanation: