Since J is the midpoint of HK, that means HK is split into two sections HJ and JK that are the same length.
1) You are told that the m<span>easure of segment HJ = 9x-2 and that of segment JK = 4x+13. Since you also know they are equal lengths, you can set these equations equal to each other to find the value of x! HJ = JK </span>9x-2 = 4x+13 5x = 15 x = 3
2) Now you know x = 3. Plug that into your given equations for HJ and JK to find the length of each segment (or a shortcut would be to find one of them, and then you also know the other is the same length. I'm doing both, just to make sure I don't make a silly mistake!): HJ= <span>9x-2 </span>HJ = 9(3) - 2 HJ = 27 - 2 HJ = 25
JK = 4x + 13 JK = 4(3) + 13 JK = 12 + 13 JK = 25
3) Finally, the length of HK is just the length of HJ + JK, or HK = 25 + 25 = 50.
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