7<n<8 is the right answer
If vertex angle is 42, and the base angles are congruent, this is an isosceles triangle, they each measure: 180-42/2. They each measure 69 degrees. The length of sides don't matter.
Your answer is A, since there is a variable and two numbers, two numbers is the binomial part. Hope this helped!
Answer:
False. All triangles must have a total of 180°. 60° + 60° + 70° = 190°.
