Question

Kayla began a science experiment with 18 grams of an unknown solid. During the experiment, the change in the mass of the solid was – 7 grams. What was the mass of the solid at the end of the experiment? To solve the problem, Edna subtracted 18–( – 7) and came up with an answer of 25 grams. Is Edna correct? Why or why not?

Answer 1

Answer:

yes she is correct

Step-by-step explanation:

any number that is subtracted by a negative number will always be negative. meaning 18 subtracted by negative 7 would equal 25.

Answer 2

Answer:

No. Enda should have added 18+ (-7) because she needed to add the initial mass and the change in mass.

Step-by-step explanation: