Answer:
z=(sqrt(10)-1)/2 or z= -(sqrt(10)-1)//2
Step-by-step explanation:
To complete the square, the last term has to be 1. So adding 10 to both sides, we get:
4z^2+4z+1 = 10
Since 4z^2+4z+1=(2z+1)^2,
(2z+1)^2 = 10.
Taking the square root of both sides, we get
2z+1=sqrt(10) or 2z+1=-sqrt(10)
So z=(sqrt(10)-1)/2 or z= -(sqrt(10)-1)//2
Answer:
(6 / 4) * (7 + 9)
Step-by-step explanation:
sry that took me so long lol
Answer:
[0,∞)
Step-by-step explanation:
We can easily solve this question by plotting the equation with the use of a plotting tool or any graphing calculator.
The equation is
y=3^(√x)
Please see attached image
Since the x is inside a square root, we know that x must be greater or equal to zero.
By looking at the graph, we can check that the domain of the function is
[0,∞)
1 : 8.4 min
1 : 7.14 every hour
So they wash 7 windows every hour