A Variable Electric Current Is Given By $t = t ^ { 2 } - 7 t + 14$

question 129

Multiple Choice

A variable electric current is given by $t = t ^ { 2 } - 7 t + 14$ , where t is in seconds. At what time is the current i is equal to 4 A.

• A) At times 2 and 5 seconds the current i is equal to 4 A.
• B) At times 3 and 4 seconds the current i is equal to 4 A.
• C) At times 4 and 5 seconds the current i is equal to 4 A.
• D) At times 2 and 2.5 seconds the current i is equal to 4 A.
• E) At time 2 seconds the current i is equal to 4 A.

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