Adam plans to choose a video game from a section of the store where everything is 75% off. He writes the expression d−0.75d to f
ind the sale price of the game if the original price is d dollars.
Rena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars.
Use the drop-down menus to explain what each part of Adam's and Rena's expressions mean.
Rena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars.
Use the drop-down menus to explain what each part of Adam's and Rena's expressions mean.
2 answers:
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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.