a coin contains 9 grams of nickel and 16 grand of copper for a total weight of 25 grams what if the percentages the metal in coi
2 answers:
Answer: 64%
Step-by-step explanation:
Given : A coin contains 9 grams of nickel and 16 grams of copper for a total weight of 25 grams .
i.e. Total weight of coin = 25 grams
weight of copper in a coin = 16 grams
Then , the percentages the metal in coins is copper is given by :-
Hence, the percentages the metal in coins is copper = 64%
You might be interested in
The solution of the system of equation is the intersection point of the two quadratic equations, so we need to equate both equations, that is,
So, by moving the term -3x^3+20 to the left hand side, we have
Then, in order to solve this equation, we can apply the quadratic formula
In our case, a=5, b=-3 and c=-30. So we get
which gives
By substituting these points into one of the functions, we have
and
Then, by rounding these numbers to the nearest tenth, we have the following points:
Therefore, the answer is the last option