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  1. shingiechingz@8

    Mathematics: Post your doubts here!

    #5
  2. shingiechingz@8

    Mathematics: Post your doubts here!

  3. shingiechingz@8

    Mathematics: Post your doubts here!

    A spherical balloon is allowed to deflate. The rate at which the air is leaving the balloon is proportional to the volume, V of the air left in the balloon. When the radius of the balloon is 15cm, air is leaving at a rate of 8cm3/s find the expression of dV/dt.....please help
  4. shingiechingz@8

    Mathematics: Post your doubts here!

    need help with ques #7(b)
  5. shingiechingz@8

    Mathematics: Post your doubts here!

    you can also memorise this if (x-a)(x-b)<0 then a<x<b if a<b b<x<a if a>b if (x-a)(x-b)>0 then x<a , x>b if a>b x>a ,x<b if a<b
  6. shingiechingz@8

    Mathematics: Post your doubts here!

    guys i need help with #8(ii) and (iii)
  7. shingiechingz@8

    Mathematics: Post your doubts here!

    substitute any value when x<-7 we get a positive value which is not the solution (>0) substitute any value when x>1 we get a positive value which is not the solution (>0) sustitute values when -7<x<1 we get a negative value which is the solution....[<0]
  8. shingiechingz@8

    Mathematics: Post your doubts here!

    I got another question...... the variable complex number z is given by z=2cosA+i(1-2sinA) whre A takes all values in the interval -pi<A<pi prove that the real part of 1/(z+2-i) is constant for -pi<A<pi ............
  9. shingiechingz@8

    Mathematics: Post your doubts here!

    guys i need your help..... P,Q and R are the angles of a triangle such that cosP=3/5 and cosQ=5/13 Without using a calculator find the value of cosR [2]
  10. shingiechingz@8

    Mathematics: Post your doubts here!

    guys i need help with question #9(b) on this paper........... please help!!!!!!!!!!!!!!!!!!!!:(:cry::(:cry:
  11. shingiechingz@8

    A level Biology: Post your doubts here!

    guys what is the function of the glycocalyx
  12. shingiechingz@8

    Chemistry: Post your doubts here!

    yes all of them......................
  13. shingiechingz@8

    Chemistry: Post your doubts here!

    your answer at (v) is not equal to 1,5*10-4 mol4dm-12
  14. shingiechingz@8

    Chemistry: Post your doubts here!

    guys can you work out this question........................... An excess of sparingly soluble solid, M(OH)3 was added to 200cm3 of 0,1 mol/dm3 KOH. The mixture was shaken, allowed to reach equilibrium at rtp and the filtered. 25.0cm3 of the filtrate was titrated with 0,2mol/dm3 of HCl of which...
  15. shingiechingz@8

    A level Biology: Post your doubts here!

    does anyone have an e-book written Biological Science by R.Sopper. if you do , please do upload
  16. shingiechingz@8

    A level Biology: Post your doubts here!

    it may seem a bit weird but its true
  17. shingiechingz@8

    A level Biology: Post your doubts here!

    in my country we are based on the old papers [CIE SYLLABUS] 1998
  18. shingiechingz@8

    A level Biology: Post your doubts here!

    guys where can l find some old biology past exam papers like from 1995-1998
  19. shingiechingz@8

    A level Biology: Post your doubts here!

    fig shows the relationship between parts of neurones Name H and F [2] Describe how a nerve impulse passes from cell A to cell B [4]
  20. shingiechingz@8

    A level Biology: Post your doubts here!

    Guyz more questions Describe the structure and function of the endosplasmic reticulum 6 marks Explain the roles of the Golgi apparatus 6 marks outline the calvin cycle 6 marks
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