Selection C is appropriate for a fence that extends x feet away from the house and utilizes the full 30 ft width of the house.
First you check for Pythagoras' Theorem.
Is 8.6² = 8.1² + 2.6² ?
8.1² + 2.6² = 65.61 + 6.76 = 72.37
8.6² = 73.96
8.1² + 2.6² ≠ 8.6²
Since Pythagoras' Theorem is not satisfied it is not a right angled triangle.
The longest side is 8.6, let's find the angle facing the longest side 8.6.
By cosine formula CosA = (b² + c² - a²) / (2bc)
CosA = (2.6² + 8.1² - 8.6²) / (2*2.6*8.1) = -1.59/42.12 = -0.0377
A = Cos inverse (-0.0377) = 92.1 degrees
So there is an angle is greater than 90 degrees.
Answer:
The answer is B.
Step-by-step explanation:
x^2-5x = x + 5
(x^2-5x)( x + 5)
x^3 - 25x^2+25x^2-25x
x^3 - 25x
The original price is $4.50 because when you multiply it by 50% you get $2.25