So first create and define your variables:
Z = amount of zebra fish
N = amount of neon tetras
Now create your equations:
2z+2.15n=31.20
z+n=15
This is your system. There are multiple methods to use but in this problem I’ll use the substitution method by simplifying the bottom equation.
2z+2.15n=31.20
z=15-n
Now I’ll plug the bottom equation into the top one.
2(15-n)+2.15n=31.20
And just solve from here.
30-2n+2.15n=31.20
0.15n=1.20
n=8
So he bout 8 neon tetras, and 15-8= 7, so he bought 7 zebra fish
Answer: 8.69 (read explanation)
Step-by-step explanation:
If the one above it is only 8 and x is slightly better it would make much more sense for it to be 8.69..... try it, it sounds quit accurate.
Answer:
y ≈ 2.1
Step-by-step explanation:
If you look at the graph and locate on the x axis 2, you can see that directly above on the line is a little more than 2.
Answer:
g) 
, h) 
Step-by-step explanation:
We proceed to solve each equation by algebraic means:
g) 
1) Given
2) 
Definition of division
3) 
4) 
Associative property
5) 
/Result
h) 
1) Given
2) 
Definition of division
3) 
4) 
Factorization/Distributive property
5) ![\left(\frac{1}{3} \right)\cdot (x+4)\cdot (x+2)\cdot \left(\frac{x-4}{x-4} \right)\cdot \left[\frac{x-5}{(x-5)^{2}} \right]](https://tex.z-dn.net/?f=%5Cleft%28%5Cfrac%7B1%7D%7B3%7D%20%5Cright%29%5Ccdot%20%28x%2B4%29%5Ccdot%20%28x%2B2%29%5Ccdot%20%5Cleft%28%5Cfrac%7Bx-4%7D%7Bx-4%7D%20%5Cright%29%5Ccdot%20%5Cleft%5B%5Cfrac%7Bx-5%7D%7B%28x-5%29%5E%7B2%7D%7D%20%5Cright%5D)
Modulative and commutative properties/Associative property
6) /
/Definition of division/Result
