Answer:
d>-150
Step-by-step explanation:
Answer: 133 minutes
Step-by-step explanation:
Hi, to answer this question we have to write an equation for the cost of each company:
The cost is equal to the fixed fee (40) plus the product of the cost per minute talking on the phone (0.25) and the minutes spent talking in the phone in the month (m)
40 + 0.25 m
The cost is equal to the fixed fee (60) plus the product of the cost per minute talking on the phone (0.10) and the minutes spent talking on the phone in the month (m)
60+ 0.10m
- Since both costs must be equal:
40 + 0.25 m = 60+ 0.10m
Solving for m:
0.25m-0.10m = 60-40
0.15m = 20
m = 20/0.15
m= 133.34 minutes
= 133 minutes (rounded)
Answer:
The Solution of the equation is
x= 5 ±
Step-by-step explanation:
We are supposed to find the solution of the equation by completing square method
our given equation is
2x² + 20x + 10 = 0
Dividing whole equation by 2
we will get
x² + 10 x + 5 = 0
Now we will write the middle term in factor form to see what we will be needing to make it perfect square
it would be written as
x² + 2(5) x + 5 = 0
Now adding 20 on both sides we get
x² + 2(5) x + 5 + 20 = 20
x² + 2(5) x + 25 = 20
(x)² + 2(5) x +(5)² = 20
Now we have the form of a²+2(a)(b) + b²
And also we know that
a²+2(a)(b) + b² = (a+b)²
So our equation becomes
(x+5)² = 20
Taking square root of both sides it becomes
square cuts out with square root so
it becomes
x+5 = ±
We know that
So it becomes
x+5 =±
Subtracting 5 from both sides
it becomes
x= 5 ±
So
The Solution of the equation is
x= 5 ±
Answer:
C. Rocks.
Step-by-step explanation:
A geologist usually studies rocks.
His studies are of the Earth, the composition of the rocks of the Earth and how they were formed.
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