The two plot dots below show the heights of some sixth graders and some seventh graders:

The mean absolute deviation (MAD) for the first set of data 1.2 and the MAD for the second set of data is 1.7. Approximately how many times the variability in the heights of the sixth graders is the variability in the heights of seventh graders? (Round all values to the tenths place)
A.) 1.2
B.) 1.4
C.) 2.4
D.) 2.8

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?