I'm French.
Please someone help me ‼‼

Amanda's method is linear because the number of minutes increased by an equal number every week.

Step-by-step explanation:

I took the test and got it right

 Amanda           Billy

1st week       10                   5

2nd week      20                  10 

3rd week       30                  20

4th week       40                  40

A) Amanda's method is linear because the number of minutes increased by an equal number every week.

common difference is 10.

1st week      0 + 10 = 10

2nd week   10 + 10 = 20

3rd week    20 + 10 = 30

4th week    30 + 10 = 40

Billy's method is exponential:

5(2)^x

1st week   5(2⁰) = 5(1) = 5

2nd week  5(2¹) = 5(2) = 10

3rd week   5(2²) = 5(4) = 20

4th week   5(2³) = 5(8) = 40

Mark PL