Answer:
9
Step-by-step explanation:

A. For each year a person ages his or her maximum heart rate decreases by 220 beats per minute.!
Y=t(15)+4 Is what I think this word problem would be written in Slope-intercept form.
Answer:
y = 10x + 6.
Step-by-step explanation:
y = mx + c
Here the slope m = 10 and c = 6 ( the y-intercept)
It's 6 because the point (0, 6) lies on the y-axis (where x = 0).