Step-by-step explanation:
The quadratic formula is:

A, in this case, is -2.
B is 5
C is -11
x = 
x = 
x = 
x =
and 
We can break up the fraction to make it easier on our eyes
x = 
≈1.9843
x = 
the answer to 156/15=10.4
Answer:
450
Step-by-step explanation:
If the perimeter is 90 inches then each side must equal 30 inches. To find the area of a triangle you mulptiply the base by the height and divide by 2. The base is 30 and the height is 30. 30*30=900. 900/2=450.