Answer:
186 beats per minute
Step-by-step explanation:
The maximum heart rate (r ) in beats per minute is modeled by the equation :
r = 220 - a ...(1)
Where
a is age of the person in years
If Sanchez age is, a = 34 years
Put a = 34 in equation (1)
r = 220 - 34
= 186 beats per minute
Hence, the maximum heart rate is 186 beats per minute.
You have to first make like terms

**you want the denominator to be 21
11/3*6/11=66/33=2
6 24/20-2 15/20=2 9/20
1. x=5/2
2. x=3/4-3/4y
y belongs R