We first need dy/dx.
dy/dx = -2sin(x/2)(1/2)
dy/dx = -sin(x/2)
We now find d^2y/dx^2.
d^2y/dx^2 = -cos(x/2)(1/2)
d^2y/dx^2 = -(1/2)cos(x/2)
1/5+1/3=8/15 house per day
1 house=1/(8/15)=15/8 days per house working together
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Answer:(–4.5, –2.5)
(4.5, 6)
(1.3, 3.5)
Step-by-step explanation:
The answer is +3/-3. x^2-9=0 ---> x^2=9 -----> x=+3/-3
