A coin contains 9 grams of nickel and 16 grams of copper, for a total weight of 25 grams. What percentage of the metal in the co
2 answers:
Answer:
64% of the metal in the coin is copper.
Step-by-step explanation:
A coin contains nickel = 9 grams
and copper = 16 grams.
Total weight of the coin = 16 + 9 = 25 grams
Now we have to calculate the percentage of copper in the coin.
Therefore, × 100
= 0.64 × 100
= 64%
Hence 64% of the metal in the coin is copper.
You might be interested in
switch sides
solve factoring
using the zero factor principle
solve
solve
Hope this helps
Answer:
Step-by-step explanation:
Given that,
Radius of a cone, r = 13 cm
Slant height of the cone, l = 20 cm
We need to find the surface area of the cone. The formula for the surface area of the cone is given by :
Put all the values,
So, the surface area of the cone is .
Answer:
cos 225° =
sin 225° =
tan 225° = 1
Step-by-step explanation:
I cannot sketch a diagram, but a 225° angle is a 3rd quadrant angle and the reference angle is 45° (225 - 180 = 45)
cos and sin are negative in the 3rd quadrant and the tan is positive
cos 225° = - cos 45° =
sin 225° = -sin 45° =
tan 225° = tan 45° = 1