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Video club and functions.Corrected math exercises online in third (3ème) on affine and linear functions.
Exercise Answer Key:
A video store offers different rates for borrowing DVDs:
Rate A : 5 € per DVD borrowed.
Rate B: 2.50€ per DVD borrowed, after paying a subscription of 18€.
Rate C: 70€ subscription for an unlimited number of DVDs.
1. Copy and complete the following table:

5 DVDS 
15 DVDS 
25 DVDS 
Cost at rate A 

Cost at rate B 

Cost at rate C 
We note the number of DVDs borrowed
2. Express as a function of :
the price paid f() at rate A; the price paid g() at rate B and the price paid h() at rate C.
3. Graphically represent, in an orthogonal frame, the following three functions:
Scale:
xaxis: 1 cm for 2 DVDs
ordinate axis: 1cm for 5 €.
4. a) Solve the equation 5= 2.5 + 18
b) Interpret the result.
Conclusion:
the function curves of the functions f and g intersect for .
5. a) Graphically solve the following inequation: .
For
b) Then find the result by calculation.
6.
Synthesis: give the most interesting rate according to the number of DVDs borrowed.
This exercise is being corrected.
Information about this answer key:
Title:
Video Club and Functions
Correction:
Video club and functions.Corrected math exercises online in third (3ème) on affine and linear functions.
Type:
Answer key to third grade math exercises
Level:
third
The exercises in the third grade
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