1. On plant korba, a solar blast has melted the ice caps on its equator. 9 years after the ice melts, tiny planetoids called echina start growing on the rocks. Echina grows in the form of coicle, and the relationship between the diameter of this citele and the age of echina is given by the formula d=4*√ mm and t the number of years since the solar blast. Jagan recorded the radius of some echina at a particular sport as 7mm.How many years back did the solar blast occur? a) 17 b) 21.25 c) 12.25 d) 14.05

• actually here the formula is not clearly given..
  the given formula is d=4*sqrt(t-9)mm
  given radius=7mm
  diameter=14mm
  14=4*sqrt(t-9)
  3.5=sqrt(t-9)
  3.5^2=t-9
  12.25+9=t....t=21.25
  ans B
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