Answer:
Part a) 
Part b) 
Step-by-step explanation:
Part a) Write an equation for T (d)
Let
d ----> the number of days
T ---> the time in minutes of the treadmill
we know that
The linear equation in slope intercept form is equal to

where
m is the slope or unit rate
b is the y-intercept or initial value
In this problem we have
The slope or unit rate is

The y-intercept or initial value is

substitute

Part b) Find T (6), the minutes he will spend on the treadmill on day 6
For d=6
substitute in the equation and solve for T


This would be 525 / 0.70 = $750 Answer
Answer:
45
Step-by-step explanation:
a = 78/20=45
Hey there!
We'll write our linear equation in the slope-intercept form, which is:
y = mx +b
Where m is the slope and b is the y-intercept. With that being said, we don't have to solve for anything here. We have both the slope in the y-intercept to plug in. We have:
y = 3x - 2
With 3 as the slope and 2 as the y-intercept.
Hope this helps!