# 14 ) On planet zorba, a solar blast has melted the ice caps on its equator. 8 years after the ice melts, tiny plantoids called echina start growing on the rocks. echina grows in the form of a circle and the relationship between the diameter of this circle and the age of echina is given by the formula
d = 4 * v (t - 8) for t = 8
where d represents the diameter in mm and t the number of years since the solar blast.
Jagan recorded the radius of some echina at a particular spot as 8mm. How many years back did the solar blast occur?
a) 24 b) 12 c) 8 d) 16

• The equation should be d = 4*sqrt(t-8). Radius given as 8. So diameter = 16. Substitute d in equation.
  16 = 4*sqrt(t-8) => 4 =sqrt(t-8) => t =24.
• 13 years agoHelpfull: Yes(12) No(1)
• ans is 24 ....
• 13 years agoHelpfull: Yes(3) No(2)
• Ans:12 bcoz d=16
  16=4*v(t-8)=>t=4+8=12
• 13 years agoHelpfull: Yes(3) No(5)
• it should be 16....is it??
• 13 years agoHelpfull: Yes(2) No(1)