I am a little confused about the question you are trying to ask. It is an isosceles triangle because it has two sides of equal length.
The other angle would be...
180-2(55)=70 degrees
Answer:

Step-by-step explanation:
Given

Required
Write a definition
First, we derive a formula for the series using:

From the attached data;


So:



Collect like terms


So, the definition for first 7 terms is:

The correct answer is 1 5/12. Hope this helps.
Answer:
C)two thirds x + 10 = 21
Step-by-step explanation:
The equation for determining how much it would be paid for the student tickets is shown below:
Given that
The ticket of an adult is $21
Now let us assume the price of the student ticket be x
So two third would be 2 ÷ 3x
And for adult it would be
2 ÷ 3x + 10
Now the equation is
2 ÷ 3x + 10 = 21
So after solving this the option c is correct
And the rest of the options are wrong