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?