Answer:
c
Step-by-step explanation:
Hi
(1)-(-9) = 10
Yes it's equal two because we know that -×- = +. So now you have 1+9 = 10
Got it ? If you have any further question please let me know.
Answer:
270 minutes.
Step-by-step explanation:
30d
d=9
30x9= 270
270 minutes.
plz mark me as brainliest. :)
53,61,69
it’s adding 8 every time.
Notice that:

Now, we use the formula for the z-score:

Then the percentage of the calls that lasted less than 10 min is 15.87%