Answer:
-4
Step-by-step explanation:
think of it like this -6+2
When you estimate, you round the numbers up or down. In this case, I'll round 4,377 down to 4,000, because 8 divides nicely into that number. 4,000/8 = 500.
You could estimate it to be about 500.
Hope that helped you.
(You can round your own numbers if you would like, but remember that rounding should make it easier for you to solve!)
Answer:

Step-by-step explanation:
The scientific notation:

We have:

The conjugate of any pair is just the same pair with a different sign in the middle.
a + b conjugate a - b
a - b conjugate a + b
-z - w conjugate -z + w
and so on.
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