Answer:
Grace should use her phone for 58 minutes to maintain an average of 55 minutes.
Step-by-step explanation:
Usage of first month = 43 minutes
Second month = 62 minutes
Third Minutes = 57 minutes
Let, the usage of fourth month = k minutes
Mean of the data = 5 minutes
Now, Average of a Data = 
⇒
or, 55 x 4 = 162 + k
⇒ 220 - 162 = k
or, k = 58 minutes
So, Grace should use her phone for 58 minutes to maintain an average of 55 minutes.
Answer:
Hello!
______________________
x4 – 6x2 + 5
= ( x^2 - 5) ( x + 1 ) ( x - 1 )
Step-by-step explanation: Factor.
Hope this helped you!
He has the same as well 6.5
I assume that the answer the number 13 is that he applied the principle incorrectly.