<PRE><B>Question 1180465</B>
Triangle DEF is an isosceles triangle.
 Find the value of x, then find the measure of angle D.
 And the numbers are (4x+1) at D (5x-4) at F 
:
Assuming that D is the single angle and E * F are the equal angles of the isosceles triangle
:
D + E + F = 180
Substituting, find x
(4x+1) + (5x-4) + (5x-4) = 180
Combine like terms
4x + 5x + 5x + 1 - 4 - 4 = 180
14x - 7 = 180
14x = 180 + 7
14x = 187
x = 187/14
x = 13.357,  seems like you should have an integer solution here, anyway
find D
4(13.357) + 1 = 54.428 degrees
:
:
Check this by finding the other two angles
5(13.357) - 4 = 62.785
total the angles
54.428 + 62.785 + 62.785 = 179.998 ~ 180</PRE>