Take the 2 times you are given and add them to x and divide the entire left side of the equation by 3:
54.3+56.1+x/3=55
54.3+56.1+x=165
x=54.6
The 3rd lap took him 54.6 seconds to run
The perimeter of the triangle is: 13x+6
Step-by-step explanation:
The perimeter is the length of the outer boundary of any closed geometrical shape.
So,
Given

The perimeter will be:

The perimeter of the triangle is: 13x+6
Keywords: Perimeter, geometry
Learn more about perimeter at:
#LearnwithBrainly
Answer:
Take the coefficient of ''n'', divide it by 2, and raise it to the second power;



We know the slope is 2 (because it increases 2 units every one unit) and the y-intercept is 0
y = mx + b
where m is the slope and b is the y intercept
y = 2x
Have an awesome day! :)