1
64
To be both, a cube and a square, the number would have to be a 6th power. 26 = 64 is too small 46 = 4096 is too large So the only possibility is 36 = 729
Nothing in this universe: 16,25,36,49,64 & 81 are the only 2-digit squares.
1
87 is the only 2-digit number that is 6 greater and 13 less than a square, but it is not prime.
64
To be both, a cube and a square, the number would have to be a 6th power. 26 = 64 is too small 46 = 4096 is too large So the only possibility is 36 = 729
Nothing in this universe: 16,25,36,49,64 & 81 are the only 2-digit squares.
9
1
87 is the only 2-digit number that is 6 greater and 13 less than a square, but it is not prime.
16
The ending digit of square number is either 0, 1,4,5,6 or 9 only.
16
4
The volume of a cylinder is a product of its length, the square of its radius, and the irrational number pi. The radius is half the diameter, so that the volume of this cylinder in cubic feet is (4)(0.5)2(pi) = about 3.14 cubic feet. There are 27 cubic feet per cubic yard, so that this equals 3.14/27 = about 0.12 cubic yard, where the last digit is depressed because it may not be significant -- there is only a single significant digit given for the dimensions of the cylinder.
A one digit number is a number with only one number. For example: 12 is a two digit number. It has two numbers. 3 is a one digit number because it only has one number.