Your friend grace needs help to find the values of x, y and z in the figure below

Answers:

x = 57

y = 86

z = 37

Work Shown:

x+123 = 180 since x and 123 form a straight line

x = 180-123

x = 57

y = 86 since the y and 86 angles are vertical angles

For any triangle, the three angles always add to 180. So,

x+y+z = 180

57+86+z = 180

143+z = 180

z = 180-143

z = 37

As a check,

x+y+z = 57+86+37 = 180

which confirms the value of z

d

step-by-step explanation:

d

1/4 because there is 4 grades.