I hope this picture helps :)
The answer for B is 270.
450 • 0.6 =270
Answer:
B
Step-by-step explanation:
From the figure, we can say:
∠NFG + ∠EFN = ∠EFG
We substitute the given measure and write:
6x + 4 + 24 = 12x - 2
Now, we simply solve this algebraically for "x". Shown below:

x is 5, so B is the correct answer.
For this question you have to find how many heartbeats are in 1 minute.
So if you divide 210 by 3 you get 70
So, my answer here would be. 70 heartbeats per minute