I'm guessing that the two expressions are for separate equilateral triangles.
If so, the equations would be:
3(3x-14)=180
3(x+4)=180
to solve the first equation, divide by 3:
3x-14=60
then, add 14 to both sides:
3x=74
lastly, divide both sides by 3:
x=24.667
to solve the second equation, divide both sides by 3:
x+4=60
then, subtract 4 from both sides:
x=56
X=5
55+(5x+10)=90
(this is a right triangle since all three angles must add up to 180 degrees)
55+5x+10=90
65+5x=90
-65 -65
——————
5x=25
(get the x alone by dividing both sides by 5)
x=5
Start here: A = 18 ft^2 = L * W. Next, L = 2W.
Merging these 2 formulas lets us eliminate L:
18 ft^2 = (2W) * (W) = 2W^2.
So W^2 = 9 ft^2, and W=3 ft. Please use L = 2W (from above) to calculate L.
