Dina was running for two hours at a speed of 6 miles per hour. How far did she run?
2 answers:
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We have that the probability of Janice rolling a 2 or 5 on her 7th toss of the dice is
From the question we are told that
Janice rolled either a 2 or a 5 on the last 6 rolls of the die
Janice rolling a 2 or 5 on her 7th toss of the dice
Where
Janice roll the standard die 7th time the probability of getting 2 or 5 is
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B. (k+10f)(k-5f) you can tell in 2 ways. 1. if the second sign is neg then the signs in the factors are going to be one neg and one positive so that knocks out C and D. Then you look at the second term and since the 5 is positive then the 10 has to be positive so you end up with a positive 5kf.
The second way is to FOIL them out. When you check B you get
combine your like terms and you have your original expression of 
Hope that helps
The second way is to FOIL them out. When you check B you get
Hope that helps