At the bank, Brent exchanges $50 in bills for 50 one-dollar coins. The total mass of the coins is 405 grams. ESTIMATE the mass of 1 one-dollar coin

To find the answer, you should divide 405 by 50 to find the mass of one coin. The formula should look like this:
[tex] \frac{405}{50} [/tex]
= 8.1
The exact mass is 8.1 grams, but because you want an estimate, the answer should be
About 8 grams for the mass of 1 one-dollar coin