Video club and functions : correction of the exercises in third grade

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Video club and functions.Corrected math exercises online in third (3ème) on affine and linear functions.

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 $5\times \,4=20$ $5\times \,15=75$ $5\times \,25=125$ Cost at rate B $18+5\times \,2,5=18+12,5=30,5$ $18+15\times \,2,5=18+37,5=55,50$ $18+25\times \,2,5=18+62,5=80,50$ Cost at rate C $70$ $70$ $70$

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:
x-axis: 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.

Title:
Video Club and Functions
Correction:

Video club and functions.Corrected math exercises online in third (3ème) on affine and linear functions.

Type:

Level:
third

The exercises in the third grade

After having consulted the answer key of this video exercise club and functions in third, you can return to the exercises in third

Continue to practice by consulting the
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