Answer:
No, 15/21 and 40/56 do not form a proportion.
Step-by-step explanation:
Axis of symmetry- x=-1
-b/2a
Mark brainliest please
Because segments XY and XZ are of equal length, angle Y and angle Z must be congruent.
All inner angles must add to 180 degrees since it's a triangle.
70+70+x=180
140+x=180
x=40
Final answer: D
Answer:

Step-by-step explanation: