Answers edited by salamat

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• Can you help me ?
  
• What is value of #X# such that #P(-X < Z < X)=0.95#?
  
• Question #6074d
  
• Question #918e5
  
• Question #da9aa
  
• How do use the binomial theorem to calculate 6C4?
  
• How do you write a rule for the nth term of the arithmetic sequence #a_7=21, a_13=42#?
  
• The length of human pregnancies from conception to birth varies according to a distribution that is normal with mean 266 days and standard deviation 16 days. Between what values do the lengths of the middle 95% of all pregnancies fall?
  
• How do you solve #5- \frac { a - 11} { a + 4} = \frac { a ^ { 2} - 1} { a + 4}#?
  
• Question #f3cab
  
• Question #28946
  
• Sin^4x-cos^4x= -cos2x or cos2x??
  
• Which value of b would make #16x^2 -bx+25# a perfect square trinomial?
  
• Question #9eb47
  
• Ruby red paint costs $0.50 per square inch. A ball is painted ruby red and costs $100.00 to paint. What is the diameter of the ball?
  
• Show that #10^logx = x# ?
  
• How do you solve #-18\leq 6- 4x \leq 10#?
  
• How do you graph #x+4y=-8#?