Answer:
This system has one solution (x=2 and y=2), then the answer is A.
Step-by-step explanation:
The system of equations is:
(1)
(2)
Let's multiply the first equation by 2 and subtract it to the second equation
Using this value in (1) we can find y.
Therefore, this system has one solution (x=2 and y=2), the answer is A.
I hope it helps you!
We need to test the hypotheses:
The confidence interval for proportion is
.
Here
The z value to be used is 1.96.
The 95% CI is
.
Since 0.5 lies in the interval (0.488,0.543), we cannot reject the null hypothesis with 95% confidence.
Answer:
Step-by-step explanation:
f(x) = - 4√x
1) the domain : x ≥ 0 : D= [0;+∞[
2) the rang of : f is the domain of the inverse
y = -4 √x calculate x ..... ( x ≥ 0)
y ≥ 0 : y² = ( -4 √x )²
y² = 16 x
x = y²/16
the inverse is : g(x) = x²/ 16 .... x ≥ 0 the range is : D= [0;+∞[ ( same domain)
The angle sum of triangle is 180 degrees. 180-37-79
so the ans should be 64 I think