Explanation:
'29' is midway between the bases ....so it is the average of the bases
[(10x+5) + (8x-1)] / 2 = 29
10x + 5 + 8x-1 = 58
18x + 4 = 58
18x = 54
x = 3
The ST = 10x + 5 = 10 (3) + 5 = 35 units
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