Question

Two stores have movies to rent

Answer 1

Answer:7

Step-by-step explanation:

In the first store, you pay 12.5+1.5x per x movies

In the second store, you pay 3.5x per x movies

The first store offers a better deal when:

12.5 + 1.5x > 3.5x

12.5 > 2x

6.25 > x

Which means if you rent minimum 7 movies in month, you should go to the first store

Answer 2

Answer:

7

Step-by-step explanation:

We know that the first store charges $12.50 per month, which is a initial condition, and charges additionally $1.50 per movie, which is variable, this represents the ratio of change, so this can be expressed as

$\ 12.50 + \ 1.50x$

Where $x$ represents movies.

Now, the second store doesn't charge and membership fee, just it charges a cost per movie which is $3.50.

Then, to solve the minimum number of movies needed to Plan A be the best choice, we just have to solve the following inequality

$\ 12.50 + \ 1.50x> \ 3.50$

Which expresses the case where Plan A is a better choice, solving for $x$, we have

$\ 12.50 + \ 1.50x> \ 3.50x\\\ 1.50x - \ 3.50x >-\ 12.50\\(-1)(-2x)>(-12.50)(-1)\\2x$

Which means that the minimum number of movies is 7, which is the next whole number after 6.