12 is 80% of what number
2 answers:
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Answer:
Step-by-step explanation:
15 Gallon of Gas costs $37.50
To determine the Unit Price, we divide the Total Cost by the number of gallons of gas bought.
Unit Price
Ok, you are given a point and you need to find the exact values for 
First thing first. We need to see if we are working with a unit circle and find the radius.
How to tell if we are working with a unit circle?
We know
is a circle.
We know that to find the radius we can use the following formula:
If
we are working with a unit circle.
Lets see if it = 1.
Square both sides now
Since we squared, we have a + and a - but we disregard the - because we do not have - radii
We can also say
![r = \sqrt[4]{65}](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%5B4%5D%7B65%7D)
Ok, since r does not equal 1, we are not working with a unit circle but we have found r, which is our radius.
Now that we know the value of r, which is, we need to look at the identities of cos, csc and tan.
The identities:
Now that we know their identities and know the radius of our circle, we can find the exact values of cos, csc and tan.
The exact values for cos, csc and tan given the point (4,-7) are:
First thing first. We need to see if we are working with a unit circle and find the radius.
How to tell if we are working with a unit circle?
We know
We know that to find the radius we can use the following formula:
If
Lets see if it = 1.
Square both sides now
Since we squared, we have a + and a - but we disregard the - because we do not have - radii
We can also say
Ok, since r does not equal 1, we are not working with a unit circle but we have found r, which is our radius.
Now that we know the value of r, which is
The identities:
Now that we know their identities and know the radius of our circle, we can find the exact values of cos, csc and tan.
The exact values for cos, csc and tan given the point (4,-7) are: