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10.
64
You get a sequence of doubled triangular numbers. This sequence can also be represented by Un = n*(n + 1), [products of pairs of consecutive integers]
four
The area of a plot of land is not enough information to determine its dimensions. First of all, there is no justification for assuming that the shape is rectangular. It could be circular, triangular or even irregular. Even if you know that it is rectangular you still do not have enough information to determine its dimensions. Double the length, halve the width and the area remains the same. Or treble the length, reduce the width to a third - same result. There are infinitely more options
rectangular has 8 triangular has 6 its really double the vertices of a square and triangle
The volume of a rectangular prism would double if you double the height.
No.
A nonagon based pyramid. An octagon based dipyramid. An octagonal base with a double-apex "pyramid". A heptagonal base with a triple-apex "pyramid". A heptagonal pyramid with a double-apex "pyramid" on the other side. A pentagonal prism. There are many more.
64
10.
You get a sequence of doubled triangular numbers. This sequence can also be represented by Un = n*(n + 1), [products of pairs of consecutive integers]
four
gable end??
1000
The area of a plot of land is not enough information to determine its dimensions. First of all, there is no justification for assuming that the shape is rectangular. It could be circular, triangular or even irregular. Even if you know that it is rectangular you still do not have enough information to determine its dimensions. Double the length, halve the width and the area remains the same. Or treble the length, reduce the width to a third - same result. There are infinitely more options
a double square pymid is a shape with at least more than eight sides. it is calld a double square prymid beacuse the shape is double the sizs