Answer:
1. 15 + 2(10) = 35
3(10) = 30
The second method is cheaper.
2. 15 videos
15 + 2(15) = 45 and 3(15) =45
Some students may draw a table to show their answer. Example:
|
$15 membership fee and $2 to rent a video |
||||||
|
Number of videos |
0 |
1 |
5 |
10 |
15 |
20 |
|
Cost for videos |
$15 |
$17 |
$25 |
$35 |
$45 |
$55 |
|
No membership fee and $3 to rent a video |
||||||
|
Number of videos |
0 |
1 |
5 |
10 |
15 |
20 |
|
Cost for videos |
$0 |
$3 |
$15 |
$30 |
$45 |
$60 |