80 percent of 100 or 8/10 80/100
In general, you just need to follow the formula for amplitude:v
y = A*sin(Bx - C) + D
The amplitude is |A|
For our problem <span>y = 5 sin 1/2x the amplitude and the answer to your question is 5.</span>
So,
I like to simplify a fraction first. This is what I do when I'm in a store trying to find the unit price.
![\frac{14}{16}](https://tex.z-dn.net/?f=%20%5Cfrac%7B14%7D%7B16%7D%20)
Factor.
![\frac{2*7}{2*2*2*2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2%2A7%7D%7B2%2A2%2A2%2A2%7D%20)
Cross out ones.
![\frac{7}{2*2*2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B7%7D%7B2%2A2%2A2%7D%20)
Multiply it out.
![\frac{7}{8}](https://tex.z-dn.net/?f=%20%5Cfrac%7B7%7D%7B8%7D%20)
In my head, I remember that one-eighth is equal to 0.125.
So seven-eighths is equal to 0.125 times 7.
0.125 * 7 = 0.875
Convert to percent form.
0.875 --> 87.5%
James answered 87.5% of his quiz correctly.
I actually have the decimal equivalents for eighths in my head when I'm shopping. So once I get seven-eighths, I immediately know how much that is. I can also subtract 0.125 from 1.000 to get seven-eighths.