Answer:
8
Explanation:
6t - 20 - 32u
= 6(6) - 20 - 32(1/4), replacing t with 6 and u with 1/4
= 36 - 20 - 8
= 8
6t -20 -32u
Let t=6 and u= 1/4
6*6 -20 -32 * 1/4
36 - 20 - 8
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