The number of pounds of copper in 120 pounds of brass is = 78 pounds of copper
<h3>Calculation of number of pounds of copper</h3>
The percentage of copper in the brass = 65%
Therefore the quantity of copper in the brass = 65/100= 0.65 pounds
This means that 1 pound brass contains = 0.65 pounds of copper
The quantity of copper in 120 pounds of brass = 120 * 0.65
= 78 pounds of copper.
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Answer:
one
Step-by-step explanation:
Answer:

Step-by-step explanation:
Given
![y = \sqrt[3] x](https://tex.z-dn.net/?f=y%20%3D%20%5Csqrt%5B3%5D%20x)
Required
Determine the average rate of change over [2,7]
This is calculated as:

In this case:
and 
So, we have:


From the table:
f(7) = 1.91
f(2) = 1.26



Given :
The percent of concentration of a certain drug in the bloodstream x hours after the drug is administered is given by
.
To Find :
Find the time at which the concentration is a maximum. b. Find the maximum concentration.
Solution :
For maximum value of x, K'(x) = 0.

Since, time cannot be negative, so ignoring x = -3 .
Putting value of x = 3, we get, K(3) = 15/( 9 + 9) = 5/6
Therefore, maximum value drug in bloodstream is 5/6 at time x = 3 units.
Hence, this is the required solution.