So for this, we will be applying the <u>zero product property</u>, which is <u>"if a x b = 0, then either a = 0 or b = 0 or both a and b = 0"</u>. In this case, a = x + 13 and b = x - 7. Solve them separately:

<u>Your answer is x = -13 and 7.</u>
Answer:
X + Y could equal to
or
.
Step-by-step explanation:
2X = 5Y
Y = 
X = 
Hence, X + Y could equal to X +
=
or Y +
=
.
Hence, X + Y could equal to
or
.
Answer:
Part 1) The number of minutes in a month must be greater than 50 in order for the plan A to be preferable
Part 2) The number of minutes in a month must be equal to 50 minutes
Step-by-step explanation:
<u><em>The question is</em></u>
Part 1) How many minutes would Kendra have to use in a month in order for the plan A to be preferable? Round your answer to the nearest minute
Part 2) Enter the number of minutes where Kendra will pay the same amount for each long distance phone plan
Part 1)
Let
x ---> the number of minutes
we have
<em>Cost Plan A</em>

<em>Cost Plan B</em>

we know that
In order for plan A to be cheaper than plan B, the following inequality must hold true.
cost of plan A < cost of plan B
substitute

solve for x
subtract 3x both sides

divide by 2 both sides

Rewrite

therefore
The number of minutes in a month must be greater than 50 in order for the plan A to be preferable
Part 2)
Let
x ---> the number of minutes
we have
<em>Cost Plan A</em>

<em>Cost Plan B</em>

we know that
In order for plan A cost the same than plan B, the following equation must hold true.
cost of plan A = cost of plan B
substitute

solve for x

therefore
The number of minutes in a month must be equal to 50 minutes
Answer:
-12
Step-by-step explanation:
Substituting, we get 0 - 12, Which is simply -12