Answer:
x = 8 units
Explanation:
In square QRST, ST = 8x + 9 and QR = 73, what is x?
in the attached figure you can see that the measurement of ST and QR are the same, it is a square, therefore 4 equal sides, we can solve with an equation
8x + 9 = 73
8x = 73 - 9
8x = 64
x = 64 : 8
x = 8 units (your answer)
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check
8 x 8 + 9 = 73
64 + 9 = 73
73 = 73
the answer is good