The perimeter is the distance all the way around.
That's the sum of all the sides.
A triangle has 3 sides.
In an equilateral triangle, they're all the same length.
If one of them is 9.9 cm, then all of them add up to (3) · (9.9 cm) .
X - the total number of fish in the tank
6/7 of the fish in the tank have red stripes. 18 of the fish have red stripes.

There are 21 fish in the tank.
Answer:

Step-by-step explanation:
you add 1 to 2 to make 3-6w= -11 then subtract 3 from both sides 3-3 cancles out and -11 - 3= -14 so -6w= -14 then divide both sides by -6 to get 7/3
Answer:

Step-by-step explanation:
Slope intercept form of the equation of a line is
where m denotes the slope of line and
denotes the y-intercept.
Equation of a line u is 
Here, slope of line u = m = 6
As the line v is perpendicular to line u, product of slopes of both the lines is equal to
.
Slope of line v 
So, slope intercept form of the line v is 
As point
lies on the line v, put
in equation 

Equation of line v is 