Which of the following is equivalent to i⁹ A. i²⁷/i³

B. (i⁴) (i⁵)

C. (i³)²

D. i

E. (i • i) x (i•i•i•i) x (i•i•i)

F. (i³)³

(there could be more than one answer)
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I think it is A and C
27/3 = 9
3x3 = 9

If they met half-way, each train traveled 360 milet s = speed of the slower trainthen(s+4) = speed of the faster train: write a time equationslow train time - fast train time = 1 hr  -   = 1multiply equation by s(s+4), cancel the denominators
360(s+4) - 360s = s(s+4)360s + 1440 - 360s = s^2 + 4sa quadratic equation0 = s^2 + 4s - 1440use the quadratic formula; a=1; b=4; c=-1440. but this will factor to: (s-36)(s+40) = 0positive solutions = 36 mph, speed of the slow trainthen obviously; 40 mph, the speed of the faster  source: