Answer:
c.
Step-by-step explanation:
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:
Choice D
Step-by-step explanation:
(x-1)²
- =(x-1)(x-1)
- =x*x+x*−1+-1*x+-1*-1
- =x²−x−x+1
- =x²−2x+1
Choice D is accurate.
Answer:
-50 because your taking out 50 dollars
f(x) = 4x - 5
g(x) = 3x + 7
Both of them have no existence conditions, so both has real as they domain
f(x) + g(x) = (4x - 5) + (3x + 7) = 4x + 3x + 7 - 5 = 7x + 2
Since both has real as they domain, f(x) + g(x) will too.