Answer:
56 min
Step-by-step explanation:
The main identity you need is the double angle one for cosine:

We get

Expand the numerator to apply the identity again:




Finally, make use of the product identity for cosine:

so that ultimately,


Answer:
V=4298.0915\approx 4298.09
V=4298.0915≈4298.09
Step-by-step explanation:
Using the given assumption, there are 3.
The sample space for rolling two dice and finding the sum is:
2 3 4 5 6 7
3 4 5 6 7 8
4 5 6 7 8 9
5 6 7 8 9 10
6 7 8 9 10 11
7 8 9 10 11 12
From the sample space alone, there are 5. However, since a 3 and a 5 is the same as a 5 and a 3, this means that 2, 6 is the same as 6, 2 as well; this takes 2 off of the 5, leaving us 3.
They would be traveling at 47.5 mph