13 Deandra designs an experiment to test how far a rubber band stretches when objects of different mass are suspended from it. She records her data in a chart.
Mass (g)
Stretch (cm)
Mass (g)
Stretch (cm)
10
4.
1
40
20
2
50
4.8 -
30
5.5
3
60
Which variable is independent?
C Time
A Band type
B Stretch
D Mass

i think is the letter D mass.

A

Independent variable is the one thing not changed, or not affected by the other variables. Time, stretch and mass are all changed or affected by eachother.

the numbers are even higher.

explanation:

statistics have shown that more that 60% of test takers fail the first time and have to retake the test.