Dont know the firat question but the propability is 43 out of 100 percent
Answer:

Step-by-step explanation:
Given
Regression Equation:

Required
Determine the slope of the regression line
The equation of regression is of the form

Where b represents the slope;
Compare
to the given equation

We have that:




Hence; the slope is:

32 is your initial value, because that is what he starts with
Answer:
He started with 180.
Step-by-step explanation:
If 90 is 50% of what he started with, then the other 50% is 90
Answer:
7/12 of band practice was spent on playing music