This kind of problems are solved using Bernoulli's distribution. Everytime you have a win/lose scenario, and you know the probability 
of winning, and you want 
successes over 
trials, you have the following probability:
You want the probability of having at least three successes, i.e. you are interested in the cases k=3 and k=4. The corresponding probabilities are
So, the total probability is 
Answer:
C
Step-by-step explanation:
Let d = the distance from camp
d < 1.8 + 2.6 = 6.4
d > 2.8
so 2.8 < d < 6.4, therefore d could be 5.3
Answer:
Below
Step-by-step explanation:
1. -4, -|2|, -1, |-3|, 4
2. -7.5, -7.2, 9.5, 10.5
3. 7
5. 13
6. -9
7. 
8. -1.36
9. 
10. -27.2
11. 22 * 2 + 7 * 0 - 5 * 1 = 39
Answer: (4-4i)+(3-2i) = 7-6i
Step-by-step explanation:
To add or subtract two complex numbers, just add or subtract the corresponding real and imaginary parts. For instance, the sum of 4 -4i and 3 - 2i is 7 -6i. The numbers in standard form will be a + bi, where a is the real part and bi is the imaginary part.
