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How to find equation for elemination for points


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1.need help with this, need to find an equation for exposed wet area. and then i need to maximize that ...

area, which i know how to do, im really just struggling with coming up with an equation
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3.I am trying to figure out the optimal radius that will give the lowest surface area of a cylinder. I ...

have done the calculus which reveals that the surface area is at a minimum when height is double the radius. I am now trying to find an equation for the relationship between the amount of wasted surface area as a percentage of the minimum surface area and the ratio between height and radius. If I were to plot it on a graph, the y axis would be the percentage of excess materials needed as a percentage of the minimum possible surface area, and the x axis would be height divided by radius. Since the surface area is minimized when height=2(radius), I know that when x=2, y=0. The website explains what I am trying to do quite well and shows the graph below. I am trying to find the equation for this graph, but am unsure how to go about it.
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6.Hello! I'm currently working with complex arithmetic. And my equation is Z = sqrt(3) - i. I know how to ...

to find the norm (r) but is confused when it comes to the arg z. I know that i have to divide i/sqrt(3) if im right? But how do i convert that into radians?
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7.A class needs a total of $500 for a field trip. They already have $285. They are selling jars of peanuts to ...

eanuts to make the rest of the money for the field trip. They make $6 for each jar they sell. The diagram shows how the parts of this problem are related. Which equation can be used to find n, the number of jars they need to sell? Math item stem image
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

mathematicsalgebra Physics