Evin and amy are working on an experiment in the science lab. they start with 2.3 grams of oil and add water to get exactly 4.21 grams of solution. to find the amount of water added, they subtract the weight of the oil from the weight of the solution. kevin calculates the difference to be 3.98 grams; amy calculates it to be 1.91 grams. who is correct, and why?
kevin. 4.21 minus 2.3 equals 3.98. amy. 4.21 minus 2.30 equals 1.91.
a. kevin is correct. amy did not regroup properly.
b. amy is correct. kevin did not regroup properly.
c. amy is correct. kevin did not line up the decimals correctly.
d. kevin is correct. amy did not line up the decimals correctly.