Answer:
The positive value of
will result in exactly one real root is approximately 0.028.
Step-by-step explanation:
Let
, roots are those values of
so that
. That is:
(1)
Roots are determined analytically by the Quadratic Formula:
![t = \frac{69\pm \sqrt{4761-6182720\cdot k^{2} }}{38642}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B69%5Cpm%20%5Csqrt%7B4761-6182720%5Ccdot%20k%5E%7B2%7D%20%7D%7D%7B38642%7D)
![t = \frac{69}{38642} \pm \sqrt{\frac{4761}{1493204164}-\frac{80\cdot k^{2}}{19321} }](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B69%7D%7B38642%7D%20%5Cpm%20%5Csqrt%7B%5Cfrac%7B4761%7D%7B1493204164%7D-%5Cfrac%7B80%5Ccdot%20k%5E%7B2%7D%7D%7B19321%7D%20%20%7D)
The smaller root is
, and the larger root is
.
has one real root when
. Then, we solve the discriminant for
:
![\frac{80\cdot k^{2}}{19321} = \frac{4761}{1493204164}](https://tex.z-dn.net/?f=%5Cfrac%7B80%5Ccdot%20k%5E%7B2%7D%7D%7B19321%7D%20%3D%20%5Cfrac%7B4761%7D%7B1493204164%7D)
![k \approx \pm 0.028](https://tex.z-dn.net/?f=k%20%5Capprox%20%5Cpm%200.028)
The positive value of
will result in exactly one real root is approximately 0.028.
The midpoint of the line having the endpoints
![(x_1,y_1)](https://tex.z-dn.net/?f=%28x_1%2Cy_1%29)
and
![(x_2,y_2)](https://tex.z-dn.net/?f=%28x_2%2Cy_2%29)
is
![(\frac{x_{1}+_x_{2}}{2}, \frac{y_{1}+_y_{2}}{2})](https://tex.z-dn.net/?f=%28%5Cfrac%7Bx_%7B1%7D%2B_x_%7B2%7D%7D%7B2%7D%2C%20%5Cfrac%7By_%7B1%7D%2B_y_%7B2%7D%7D%7B2%7D%29)
basically average them
so given that the line has the endpoints of (-3,7) and (9,-2)
x₁=-3
y₁=7
x₂=9
y₂=-2
so the midpoint can be found by doing
![(\frac{-3+9}{2}, \frac{7+(-2)}{2})=](https://tex.z-dn.net/?f=%28%5Cfrac%7B-3%2B9%7D%7B2%7D%2C%20%5Cfrac%7B7%2B%28-2%29%7D%7B2%7D%29%3D)
![(\frac{6}{2}, \frac{7-2}{2})=](https://tex.z-dn.net/?f=%28%5Cfrac%7B6%7D%7B2%7D%2C%20%5Cfrac%7B7-2%7D%7B2%7D%29%3D)
![(3, \frac{5}{2})](https://tex.z-dn.net/?f=%283%2C%20%5Cfrac%7B5%7D%7B2%7D%29)
the midpoint is
Answer:
9/64
Step-by-step explanation:
The probability that the marble on the first draw is blue is 3/8.
The probability that the marble on the second draw is blue is also 3/8.
So the probability that both are blue is:
3/8 × 3/8 = 9/64 ≈ 14%
Answer:
whats the given?? what you need I don't understand