-25/8 minus 5/2
(You just turn them into improper fractions)
The expectation value is given by:

In this case we just have two options, each with probability 1/2, and the values of x are 2 and 9; then we have:

Therefore, the expectation is $6.5
Answer:
4x+4
Step-by-step explanation:
7x -3x +4
Combine like terms
7x-3x = 4x
Substitute back into the expression
4x+4
Answer:
negative
Step-by-step explanation:
rules:
+ + = +
- - = +
+ - = -
- + = - ----> (-468,256)(183,758)
4800/6 = 800
Hope this helps.