Answer:
Vertex (if it is a right triangle).
Step-by-step explanation:
4x + 2x = < y
This is because the opposite sides (which is 4x and 2x) of a triangle add up to the exterior angle (<y).
We have to find X.
As you know:

because the angles of a triangle add up to 180.
When we add them:


The 9 is multiplying with the X. We want X only and not 9 with it. So, when we take 9 to the other side, it becomes divide. As a result, the answer to x is:-

Substitute value of x into 4x and 2x to find the exterior angle:-
4x:

2x:

When we add them we get the answer for angle Y:-

Therefore, we can conclude that:

Answer:
175
the error in the diagram is that it implies Elena read 1/5 of the book, not Andre
Step-by-step explanation:
x= total number of pages
A = 1/5*x
E = A+20 = 1/5*x+20
1/5*x + 20 = 55
1/5*x = 35
x = 35*5 = 175
A) in 4 hours he can go 4*2 = 8 miles
and circular area = pie * R^2 = 3.14 * 8 * 8 =200.96 = 201 square miles
in 5 hours , area = pie* 10*10 = 3.14 * 100 = 314 sq mile.
additional area = 314 -201 = 113
hope it helped