It took 6 hours for the temp. to drop to 7.8
14
Because 8 makes the nine round up to 10 which is 14
We have the following function:
![g(x)=4\sqrt{x}-8](https://tex.z-dn.net/?f=g%28x%29%3D4%5Csqrt%7Bx%7D-8)
So if we graph this function we will get the Figure below. Thus, let's study both the equation and the graph to get some conclusions. Therefore, we can assure these statements:
First. The function is defined only for
![x\geq 0](https://tex.z-dn.net/?f=x%5Cgeq%200%20)
as shown in the Figure. This is also true because of
![\sqrt{x}](https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D)
where
![x](https://tex.z-dn.net/?f=x)
must be greater (or equal) than zero.
Second. The range of the function are the values of
![y\geq -8](https://tex.z-dn.net/?f=y%5Cgeq%20-8)
.
Third. If
![x](https://tex.z-dn.net/?f=x)
creases then
![y](https://tex.z-dn.net/?f=y)
always creases, too.
64+(2x)=35(x-1)
expand
64+2x=35x-35
minus 2x from both sides
64=33x-35
add 35 to both sides
99=33x
divide both sides by 33
3=x
the number is 3
Divide any term by the one before it, and you'll get the ratio. -20/4=-5