Final answer:
The total mass of coins in Sari's bag is calculated by multiplying the quantity of each type of coin by its mass and then adding the two results together. The mass of the half dollars is 45.36 grams, the mass of the dollar coins is 40.5 grams, and the combined mass is 85.86 grams.
Step-by-step explanation:
The student's question about the total mass of the coins in Sari's bag involves calculating the mass of coins and combining masses. To calculate these values, we will multiply the number of each type of coin by its respective mass and then sum those products to find the total mass.
A) Calculate the total mass of half dollars
The mass of each half dollar is 11.34 grams. Sari has 4 half dollars, so we calculate:
4 half dollars * 11.34 grams/half dollar = 45.36 grams
B) Calculate the total mass of dollar coins
The mass of each dollar coin is 8.1 grams. Sari has 5 dollar coins, so we calculate:
5 dollar coins * 8.1 grams/dollar coin = 40.5 grams
C) Find the combined mass of all coins
To find the total mass, we add the mass of the half dollars and the mass of the dollar coins:
45.36 grams + 40.5 grams = 85.86 grams
Therefore, the correct answer is C) Find the combined mass of all coins.