Answer:
Step-by-step explanation:
Let m denotes the number of minutes of phone use in a month.
In plan a there is no monthly fee, but the customer pays 8 cents per minute of use.
Total cost of plan a = 
In Plan B the customer pays a monthly fee of $2.40 and then an additional 7 cents per minute of use.
Total cost of plan b = 
To find amount of monthly phone use for which plan a cost more than plan b, solve the inequality 
.
Given:
Number of white roses = 4
Number of red roses = 8
To find:
The ratio of the number of red roses to the number of white roses.
Solution:
Using the given information, the ratio of the number of red roses to the number of white roses is
Therefore, the required ratio is 2:1.
1) Point-slope form
(y-y1)=m(x-x1)
m= - 3,
point (3,-4), so x1 = 3, y1 = - 4.
(y+4)= -3(x- 3)
2)Point-slope form
(y-y1)=m(x-x1)
m= - 3/4,
point (4,5), so x1 = 4, y1 = 5.
(y-5)= - 3/4(x-4)
Answer: x=5
Simplifying
5(x + -2) = 15
Reorder the terms:
5(-2 + x) = 15
(-2 * 5 + x * 5) = 15
(-10 + 5x) = 15
Solving
-10 + 5x = 15
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '10' to each side of the equation.
-10 + 10 + 5x = 15 + 10
Combine like terms: -10 + 10 = 0
0 + 5x = 15 + 10
5x = 15 + 10
Combine like terms: 15 + 10 = 25
5x = 25
Divide each side by '5'.
x = 5
Simplifying
x = 5
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<u>hope that was helpful.Thank you!!!</u>
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