Answer:
11.42 boxes
Step-by-step explanation:
For the first box bought, there is a 100% chance of getting a unique toy (since you still don't have any). E₁ = 1.
After that, there is a 4 in 5 chance of getting a unique toy from the next box, the expected number of boxes required is:

For the next unique toy, there is now a 3 in 5 chance of getting it:

Following that logic, there is a 2 in 5 chance of getting the 4th unique toy:

Finally, there is a 1 in 5 chance to get the last unique toy:

The expected number of boxes to obtain a full set is:

Answer: about $6.90
Step-by-step explanation: 106% of 3.35
100% of 3.35 is 3.35
6% of 3.35 is 0.201
Add them together and you get 3.551
When you round to the nearest cent, you get $3.55
After add 3.55 to 3.35 and you get $6.90
Answer: according to spark notes: There can be 0, 1, or 2 solutions to a quadratic equation, depending on whether the expression inside the square root sign, (b2 - 4ac), is positive, negative, or zero. This expression has a special name: the discriminant.
In this case it is 0, not 2, which was my first and wrong answer
I'm learning the exact same thing so give me some question and I can see what I can do!
Answer:
B.
Step-by-step explanation: