The answer to question 11 says "As we learned in Chapter 1, there are (4+1)(1+1)=10 different factors of 2^4*3." What is this formula refered to in Chapter 1 that gets us to 10? I could not find it.

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When we solve equations that have absolute values, when do we need to check our answers (i.e if we get two solutions, when do we need to go back to check these two into the original equation)? Seems this would take too much time in the exam.

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A cyclist traves the length of a bike path that is 225m long, rounded to the nearest mile. IF the trip took him 5h rounded to the nearest h, then his average speed must be between: -Why is the answer 40 to 51. If the max speed is 50+1/9 and min is 40+9/11, shouldnt average speed be between 41 and 50...

Another question related to this problem: In part c, since the probability of the light bulb turning on is .5, why wont the probability of 3 lighting up is 1/2? (i.e 6*.5)?

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