Use the slope formula

and plug in the values for x and y.
Given:
The power generated by an electrical circuit (in watts) as function of its current x (in amperes) is modeled by:

To find:
The current that will produce the maximum power.
Solution:
We have,

Here, leading coefficient is negative. So, it is a downward parabola.
Vertex of a downward parabola is the point of maxima.
If a parabola is
, then

In the given function, a=-12 and b=120. So,



Putting x=5 in the given function, we get




Therefore, 5 watt current will produce the maximum power of 300 amperes.
z=-3
Step-by-step explanation:
Answer:
I think the awnser is d!!!!!
To solve this just put a 1 over the 15. So it would be 12/7 + 15/1 which is 16 5/7.