Answer:
<u>2.5 seconds</u>
Step-by-step explanation:
Resting position is at y = zero which mean x intercept
So, we need to find the time between two consecutive points of intersection with the x-axis.
Which mean it is the half period of the given function as it is a sine wave
From the graph we can deduce that
<u>2.5 seconds</u> are required for the pendulum to move from its resting position, swing in one direction and return to its resting position.
Let
be the amount of the 30% alloy and
the amount of the 60% alloy the metalworker will use. However much is used, the final alloy will have a mass of

kilograms. For each kg of the 30% alloy used, 0.3 kg is copper; similary, each kg of the 60% alloy contributes 0.6 kg, so that

Now,






-3(1+6x) = 14 - x
-3 -18x = 14 -x
-18x +x = 14 + 3
-17x = 17
x = -17/17
x = -1
Therefore x is equal to -1.
Well, what's the diffrence from 5/4 to 3/8?

so, if we take 5/4 to be the 100%, what is 7/8 off of it in percentage anyway?