For this case we have the following equation:

Let 
We have:

By definition, given an equation of the form 
The quadratic formula, to find the solution can be written as:

In this case we have:

Substituting in the quadratic formula we have:
See attached image
Answer:
Option B
Answer:
mean if 7
Step-by-step explanation:
the mean is 7
Answer:c
Step-by-step explanation:
Answer:
a.6.89 + t = 8.00
Step-by-step explanation: i took the quiz