Very confused with physics questions, can someone please help?

Question

Could someone answer the following questions and explain how you answered them? thanks in advance

48. A recording timer makes 625 dots in 5.0 s. Calculate its period and its frequency 

49. Solve for the stated variable using the formula provided. 
a) A = LxW; solve for L and W
b) F = m x a; solve for m and a
c) a = v/t, solve for v and t

50. The record speed of a motorcycle is about 82 m/s (295 km/h). If the cyclist took 180 s to make one lap of the track, what was the length of the track?

Hope it helps · Accepted Answer

48) period = (5/625) = 0/008s
     T=1/f = 125 Hz

49) Im not sure what it meant by solve... is it changing the subject? 
Then the ans is :  L = A/ W       W = A/L
                             m= F/a            a=F/m
                            v=at              t=v/a
50) s = d/t 
 d= st 
   =82 * 180 = 14760m (this question is weird... is the speed constant throughout? or instantaneous?

Very confused with physics questions, can someone please help?

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