Answer:
t = 4d + 5
Explanation:
The answer can be obtained through trial and error method.
Checking :
(1) d = 1
t = 4 (1) + 5
t = 4 + 5
t = 9
(2) d = 5
t = 4 (5) + 5
t = 20 + 5
t = 25
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