Answer:
1 heart beat every 3 seconds
Step-by-step explanation:
60 seconds
20 heartbeats
60/20=3
So 1 every 3 second
y=2 x=3 i think
2y+3=y+5
y=5-3
y=2
4x-3=4y+1
4x-3=4×2+1
4x-3=9
4x=9+3
4x=12
x=12/4
×=3
-5
Explaination:
Because -3-2 is -5.
