A. For each year a person ages his or her maximum heart rate decreases by 220 beats per minute.!
Answer:
53.3%
Step-by-step explanation:
80/150=160/300
160/300=53.33/100
The decrease in calories is 53.3%
5c+10a=3570
c+a=512
...
a=512-c
so ...
5c + 10(512-c)=3570
2001: 11
2002: 15
2003: 19
2004: 17
2005: 23
2006: 20
2007: 17
2008: 13
2009: 18
2010: 21
Add all the numbers (174) not including the years and then divide by how many years there are (10) 17.4
The answer is A
let's start with attempting to isolate the variable. remember what you do to one side you have to do to the other. -1
2x=3/4x+8
-3/4x from both sides
5/4x = 8
multiply both sides by 4
5x =32
divide both sides by 5
x=6.4 or 6 2/5. sorry if this is wrong
