IBA maths qs..help

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A triangle is formed by the x-axis, y-axis, and the line y = ax + b. If a = -b, then what is the volume of the cone generated by rotating this triangle around y-axis?

if the perimeter of rectangle is 60 meters and its area is 200 square m, then one of its sides must be___________the other sidea)
A)1/3 B)triple C)Double D)1/10
 
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Inorder that the system of equations ax+2y=b,3x-y=c has no solution
a is not = to 6
a is not = to -6
a is not = b
b is not = c ??
 
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