Answer:
The answer is b = -9/2
Step-by-step explanation:
So,
To find the percentage that the copper comprises, just divide the amount of copper by the total amount of metal in the coin. In this case, we will change the denominator so that it is 100, which can easily be converted into a percentage, which is really just a fraction out of 100.

75%
75% of the metal in the coin is copper.
Answer:
The radius would be 12cm
and the height 4
gives u the surface area of 1206cm^3
Step-by-step explanation:
Answer:
1) 1:10
2) 150:2
3) 1:3
4) 20hrs : 1hrs
Step-by-step explanation: