Answers created by Pietro P.

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• A multiple choice test has 30 questions, and each has four possible answers, of which one is correct. If a student guesses on every question, what is the probability of getting exactly 9 correct?
  
• How may permutations of the word "spell" are there?
  
• An object travels North at #6 m/s# for #3 s# and then travels South at #5 m/s# for # 6 s#. What are the object's average speed and velocity?
  
• A projectile is shot from the ground at a velocity of #4 m/s# and at an angle of #(pi)/2#. How long will it take for the projectile to land?
  
• How do you find the derivative of #cos^2(4theta)#?
  
• An object travels North at # 3 m/s# for #9 s# and then travels South at # 5 m/s# for # 4 s#. What are the object's average speed and velocity?
  
• Question #ac5d5
  
• How do you differentiate #f(x)=ln2x * sin4x# using the product rule?
  
• Question #f9b61
  
• A retailer sells 8 brands across 500 locations. What statistical test can be used to determine if a recent uptick in year over year sales is significant?
  
• A triangle has sides A, B, and C. Sides A and B are of lengths #4# and #7#, respectively, and the angle between A and B is #(3pi)/4 #. What is the length of side C?
  
• Question #5170b
  
• How do you sketch #y=sin (x/2)#?
  
• Given the following information, the older the object the less accurate this method of dating becomes. How can scientists say that the Earth is billions years old?
  
• Does cellular respiration happen in humans or just in plants?