What do you mean? Question not clear.
You can "add" like you say or you could just call it subtracting. If you subtract 5 from 5 you still get zero. Then on the right side, you would do the same. You would subtract 5 from 12 getting x, which is 7.
If you added you would still get the same answers but it is easier to say just subtract. Anything you do to the left, do to the right.
Hope this helps :)
There are 30 adults. Because if there are only three-tenths of adult visitors, you're finding 30% of 100 adult visitors. There are 30 Adults.
Let x dollars be your investment at 7%;
then the investment at 3% is the rest (1000-x) dollars.
The total interest equation is
0.07x + 0.03*(1000-x) = 0.061*1000.
Express x and calculate
x = %280.061%2A1000-0.03%2A1000%29%2F%280.07-0.03%29 = 775.
ANSWER. $700 is the 7% investment; the rest, (1000-775) = 225 dollars is the 3% investment.
<h2>
Answer:</h2>
![\boxed{c. \ f^{-1}(x)=\frac{1}{\sqrt[3]{x}}}](https://tex.z-dn.net/?f=%5Cboxed%7Bc.%20%5C%20f%5E%7B-1%7D%28x%29%3D%5Cfrac%7B1%7D%7B%5Csqrt%5B3%5D%7Bx%7D%7D%7D)
<h2>
Step-by-step explanation:</h2>
Let's find the inverse function of 
to know what item we must choose as correct. So let's apply this steps:
a) Use the Horizontal Line Test to decide whether 
has an inverse function.
As shown in the graph below there is no any horizontal line that intersects the graph of at more than one point. Thus, the function is one-to-one and has an inverse function. Therefore, the inverse is a function..
b) Replace 
by 
in the equation for .
c) Interchange the roles of 
and and solve for
![x=\frac{1}{y^3} \\ \\ \therefore y^3=\frac{1}{x} \\ \\ \therefore y=\frac{1}{\sqrt[3]{x}}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B1%7D%7By%5E3%7D%20%5C%5C%20%5C%5C%20%5Ctherefore%20y%5E3%3D%5Cfrac%7B1%7D%7Bx%7D%20%5C%5C%20%5C%5C%20%5Ctherefore%20y%3D%5Cfrac%7B1%7D%7B%5Csqrt%5B3%5D%7Bx%7D%7D)
d) Replace by 
in the new equation.
![f^{-1}(x)=\frac{1}{\sqrt[3]{x}}](https://tex.z-dn.net/?f=f%5E%7B-1%7D%28x%29%3D%5Cfrac%7B1%7D%7B%5Csqrt%5B3%5D%7Bx%7D%7D)
So the correct option is:
![c. \ f^{-1}(x)=\frac{1}{\sqrt[3]{x}}](https://tex.z-dn.net/?f=c.%20%5C%20f%5E%7B-1%7D%28x%29%3D%5Cfrac%7B1%7D%7B%5Csqrt%5B3%5D%7Bx%7D%7D)
