Answer:
1.72 grams.
Step-by-step explanation:
We have been given that Gomez found the masses of three rocks for a science project. The first rock had a mass of 19.28 grams the second rock had a mass of 25.3 grams and the third rock had a mass of 46.3 grams.
First of all, we will add the masses of 1st and 2nd rock to find the combined mass of both rocks.
\(\text{Combined mass of 1st and 2nd rock}=\text{19.28 g+25.3 g}\)
\(\text{Combined mass of 1st and 2nd rock}=\text{44.58 g}\)
Now we will subtract the combined mass of both rocks from the mass of 3rd rock.
\(\text{Difference of mass }=\text{46.3 g}-\text{44.58 g}\)
\(\text{Difference of mass }=\text{1.72 g}\)
Therefore, the mass of the 3rd rock is 1.72 grams greater than the combined mass of the other two rocks.
