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(0,4) , 3x+8y=4

Write the slope-intercept form of an equation that passes through the given point and is perpendicular to the graph of each equation.

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If a plane can travel 480 miles per hour with the wind and 400 miles per hour against the wind, find the speed of the plane in still air     80 miles per hour? 

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A store mixes brazilian coffee worth $11 per kilogram and Turkish coffee worth $13 per kilogram. The mixture is to sell for $12 per kilogram. Find how much of each should be used to make a 360 kilogram...

evaluate expression

how do I evaluate the expressions, then write the answer in scientific notation?   1.  (4.2 x 10^2) (4.2 x 10^5)   2.  (2.5 x 10 ^-2)^4       write...

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