Remember that

So if
and
, then we know
.
Then use the Pythagorean identity to solve for cosine:

Answer:
<em>She can fill 19 pots.</em>
Step-by-step explanation:
Yao Xin puts
liters of potting soil in each pot.
Suppose, the number of pots Yao Xin can fill is 
So, <u>the total amount of potting soil</u> in
number of pots will be:
liters.
Given that, she has
liters of potting soil. So, the equation will be........
So, she can fill pots.
Just do normal division, just like ignore the decimal point. for a moment once you got your answer bring back the decimal point back up to your answer. You would get 0.27 as your answer.
X=1
Y=6
X=3
Y=18
X=5
Y=30
X=7
Y=42
X=9
Y=54
You need do like 25$--------100% of real price
x$---------70%
25x70=100<u>x</u>
1,750=100<u>x</u>
<u> x</u>=1750<u />divided by 100=17.5$