Answer:
Chad cuz it has more slope
Step-by-step explanation:
Hope it helps! :)
Answer:
x=5 and y=5
Step-by-step explanation:
You "plug" one equation into the other, to get a new equation that only has one variable (x or y), then you can simplify that and have your answer.
So let's plug the first into the second:
First, we convert the first equation into an x=... form. For this one, this means moving the +y to the other side:
x = 10 - y
Now we substitute 10-y for x in the second equation:
So 2x+4y=30 becomes:
2(10-y) + 4y = 30
And simplify that:
20 - 2y + 4y = 30
20 + 2y = 30
2y = 30-20
2y = 10
y = 5
This is the first answer! If we put this into the first equation, we get:
x = 10 - 5 = 5
Now we have both answers, x=5 and y=5
Answer:
Third option is correct.
Step-by-step explanation:
The given model is
![h(t)=-16t^2-30t+124](https://tex.z-dn.net/?f=h%28t%29%3D-16t%5E2-30t%2B124)
Where, h(t) is heigth of rock after time t (in seconds).
The initial height of rock is 124 ft.
The leading coefficient is negative. It means it is a downward parabola.
First we have to the x-intercepts of the function.
![0=-16t^2-30t+124](https://tex.z-dn.net/?f=0%3D-16t%5E2-30t%2B124)
Using quadratic formula, we get
![t=\frac{-(-30)\pm \sqrt{(-30)^2-4(124)(-16)}}{2(-16)}](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B-%28-30%29%5Cpm%20%5Csqrt%7B%28-30%29%5E2-4%28124%29%28-16%29%7D%7D%7B2%28-16%29%7D)
and ![t=2](https://tex.z-dn.net/?f=t%3D2)
It means rock remains in the air between
.
The value of t can not be negative, therefore rock remains in the air between
.
Third option is correct.
Answer:
A. x=8; y=9; z=1
Step-by-step explanation: