Answer:
Step-by-step explanation:
We have to write the additive inverse of the second number.
Additive inverse of 4 is (-4)
Additive inverse of (-4) = 4
A. 23 - 3 = 23 + (-3) = 20
B. 7 - (-15) = 7 + (+15) = 22
C. -15 - 4 = -15 + (-4) = - 19
200 times / 3 minutes = x times / 60 minutes
3x = 12000
x = 4000 times in an hour
A person's heart will beat 4000 times in an hour.
Hope this helps!! :)
Yes as long as the length remained the same each time