Use this systems of equations to solve:
x = first antifreeze
y = second antifreeze

Isolate y.
x + y = 15
Subtract x from both sides.
y = -x + 15
Substitute y into the other equation.
.2x + .12(-x + 15) = .18(15)
Simplify.
.2x - .12x + 1.8 = 2.7
Subtract 1.8 from both sides.
.08x = .9
Divide both sides by .08
x = 11.25
Substitute x in the equation that we isolated y in.
y = -11.25 + 15
y = 3.75
11.25 L of the first antifreeze and 3.75 L of the second.
Answer:
-9 and each term is subtracted by 5 to get the next term.
Step-by-step explanation:
The previous term is subtracted by 5.
Given, the rate of growth of St. Augustine grass is
cm per week.
We have to find the number of weeks that the grass grow to
cm.
Let's take the number of weeks be x.
In 1 week the grass grow =
cm
So in x weeks the grass grow =
cm
So we can write,

To solve it for x, first we will move 7 to the right side by multiplying it to both sides. We will get,



Now to get we will move 4 to the right side by dividing it to both sides. We will get,


So we have got the required answer.
After 3 weeks the grass grow
.
see the attached figure to better understand the problem
we know that
The point G is where all medians intersect and is often described as the triangle's center of gravity or centroid. It is formed by the intersection of the medians. The centroid divides each median in a ratio of 
so

<u>Find the value of FA</u>

therefore
<u>the answer is
</u>
