Answer:
the answer is - 2
Step-by-step explanation:
7-5=2-2=0
 
        
             
        
        
        
6x^3 + 5y^3 + 7y 
So the third option.
        
             
        
        
        
A. 7*4 
because there are no parentheses or exponents so multiplication is next
        
             
        
        
        
Answer:

So then the best answer for this case would be:
C. 2.78
Step-by-step explanation:
For this case we have the following probabability distribution function given:
Score         P(X)
A= 4.0       0.2
B= 3.0       0.5
C= 2.0       0.2
D= 1.0        0.08
F= 0.0       0.02
______________
Total          1.00
The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.
If we use the definition of expected value given by:

And if we replace the values that we have we got:

So then the best answer for this case would be:
C. 2.78