Associative
** property I believe.
Given function is
![f(x)=\left\{\begin{matrix}3x+k & x\leq -4 \\ kx^2-5 & x> -4\end{matrix}\right.](https://tex.z-dn.net/?f=f%28x%29%3D%5Cleft%5C%7B%5Cbegin%7Bmatrix%7D3x%2Bk%20%26%20x%5Cleq%20-4%20%5C%5C%20kx%5E2-5%20%26%20x%3E%20-4%5Cend%7Bmatrix%7D%5Cright.)
now we need to find the value of k such that function f(x) continuous everywhere.
We know that any function f(x) is continuous at point x=a if left hand limit and right hand limits at the point x=a are equal.
So we just need to find both left and right hand limits then set equal to each other to find the value of k
To find the left hand limit (LHD) we plug x=-4 into 3x+k
so LHD= 3(-4)+k
To find the Right hand limit (RHD) we plug x=-4 into
![kx^2-5](https://tex.z-dn.net/?f=kx%5E2-5)
so RHD= ![k(-4)^2-5](https://tex.z-dn.net/?f=k%28-4%29%5E2-5)
Now set both equal
![k(-4)^2-5=3(-4)+k](https://tex.z-dn.net/?f=k%28-4%29%5E2-5%3D3%28-4%29%2Bk)
![16k-5=-12+k](https://tex.z-dn.net/?f=16k-5%3D-12%2Bk)
![16k-k=-12+5](https://tex.z-dn.net/?f=16k-k%3D-12%2B5)
![15k=-7](https://tex.z-dn.net/?f=15k%3D-7)
![k=-\frac{7}{15}](https://tex.z-dn.net/?f=k%3D-%5Cfrac%7B7%7D%7B15%7D)
k=-0.47
<u>Hence final answer is -0.47.</u>
Answer:
y=7+3x
Step-by-step explanation:
Since she already has 7 in her account and she ADDS 3 more each day you would multiply 3 by x which represents the number of days and add that to seven because she already had it. This would equal to Y which represents the total in her account
Answer:
y=3(100)+300
Step-by-step explanation: