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

corrected by

Report an error / Note?

Sommaire de cette fiche

1 Information about this answer key:
2 The exercises in the third grade

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	$5\times \,4=20$	$5\times \,15=75$	$5\times \,25=125$
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

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:

$x\,\mapsto \,5x$

$x\,\mapsto \,2,5x+18$

$x\,\mapsto \,70$

Scale:
x-axis: 1 cm for 2 DVDs
ordinate axis: 1cm for 5 €.

4. a) Solve the equation 5= 2.5 + 18

$x=\frac{18}{2,5}=7,2$

b) Interpret the result.

Conclusion:
the function curves of the functions f and g intersect for .

5. a) Graphically solve the following inequation: $70\leq\,\,2,5x+18$ .

For $x\geq\,\,14$

b) Then find the result by calculation.

$70\leq\,\,2,5x+18$

$70-18\leq\,\,2,5x$

$52\leq\,\,2,5x$

$\frac{52}{2,5}\leq\,\,x$

$20,8\leq\,\,x$

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

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

Third grade exercises.

Find every week new math lessons adapted to your level!
Continue to practice by consulting the
math exercises for 3rd grade
.
You can also find many math videos on our Youtube channel !
Math is easy with us, so count on us!

Cette publication est également disponible en : Français (French) Español (Spanish) العربية (Arabic)

Download and print this document in PDF for free

You have the possibility to download then print this document for free «video club and functions : correction of the exercises in third grade» in PDF format.

Other documents in the category corrected by

Download our free apps with all corrected lessons and exercises.

Other forms similar to video club and functions : correction of the exercises in third grade.

Barycenter: answer key to 1st grade math exercises in PDF.
92
The answer key to the math exercises in 1st grade on the barycenter n weighted points. Use the stability and associativity properties of the barycenter in first grade. Exercise 1: It is up to you to make these constructions knowing that the barycenter is necessarily aligned with points A and…
Vectors and translation : corrected 2nd grade math exercises in PDF.
89
The answer key to the math exercises on vectors in 2nd grade. Know how to use the Chasles relation and demonstrate that vectors are collinear in second grade. Exercise 1: Are the points P, Q and R aligned? Yes they are aligned, show that the vectors and are collinear .…
Theorem of Thales: answer key for math exercises in 3rd grade in PDF.
88
Theorem of Thales and correction of the exercises in 3ème with the calculation of length and use of the cross product. Apply the direct and reciprocal part of Thales' theorem. Exercise 1: figure 1: figure 2: Figure 3: Exercise 2: Show using the direct part of Thales' theorem that…

Les dernières fiches mises à jour.

Voici les dernières ressources similaires à video club and functions : correction of the exercises in third grade mis à jour sur Mathovore (des cours, exercices, des contrôles et autres), rédigées par notre équipe d'enseignants.

On Mathovore, there is 13 624 800 math lessons and exercises downloaded in PDF.