Solve the equation for the indicated variable.I = 
for n
A. n = 
B. n = 
C. n = 
D. n = IR(Ir - E)
Answer: C
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Solve the problem.A barge takes 4 hours to move (at a constant rate) downstream for 40 miles, helped by a current of 3 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 7 hours B. 4 hours C. 10 hours D. 80 hours
Answer each question appropriately.Suppose that 
= 10. Find 
, if f is odd.
A. 30 B. -10 C. 10 D. -30
For the pair of vectors, find 
.
?
?
A. 
B. 
C. 
D. 
E. 
Solve the problem.The quad at State University is 3x feet wide. Initially, it was 1300 feet long. However, due to the construction of a new science building, the original length was decreased by 6y feet. Use the distributive property to find an expression for the area of the new quad.
A. 3900x - 7800y square feet B. 3900x + 18xy square feet C. 3900x + 7800y square feet D. 3900x - 18xy square feet