1 x 21, 3 x 7 = 21
5
Working on the .21 only. There are 2 digits in 21. The 1 is in the 100th decimal place.So .21 is also 21/100 which gives a final answer of 6 21/100
Adding 30 days to January 21 gives February 20.
21/2 = √2 ≈ 1.414 The rules of indices are that when multiplying add them. 21/2 x 21/2 = 21/2 + 1/2 = 21 = 2 So multiplying 21/2 by itself gives 2. But what number multiplied by itself gives 2? The answer is the square root of 2. Thus 21/2 is the square root of 2.
To find one third of 21, you would divide 21 by 3. This calculation gives you 7, which is one third of 21. In mathematical terms, 1/3 of 21 is equal to 7.
To find what number times 2 equals 42, you can set up the equation 2x = 42, where x represents the unknown number. To solve for x, you divide both sides by 2, which gives you x = 21. Therefore, 21 times 2 equals 42.
You can't. 17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.
Heading into a non-leap year, adding 180 days to December 21 gives June 19 of the following year. Heading into a leap year, adding 180 days to December 21 gives June 18 of the following year.
The answer is 20x21=420 and 20+21=41
21
42
Arranging the numbers in numerical order gives 18 21 25 29 32. Taking the median number (that is, the centre number) of these two gives 25.