Two. The '7' telling how many tens we've got, and the '2' telling how many ones.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
18
If you are counting the numbers 17, 18, 19, ..., 72, you will count (72 - 17) + 1 = 56 numbers (note that I added 1 because the set is inclusive, i.e. it includes 17 and 72).
72, 72, and 72.
The figure 18.03 has a total of four significant numbers
there are many (infinite) ways but just one is 72=2*(31+5)
There are infinitely many pairs. Two possibilities are: 1 * 72 10 * 7.2
To find two numbers that give a quotient of 72, you can use the equation ( \frac{a}{b} = 72 ). For example, if you choose ( a = 72 ) and ( b = 1 ), the quotient is 72. Alternatively, you could use ( a = 144 ) and ( b = 2 ) for the same result. There are infinitely many pairs of numbers that can achieve this, such as ( a = 360 ) and ( b = 5 ).
Because 10.00400 is 10.004, this has five significant digits (numbers).
Three. All nonzero numbers are significant, and any zeros in between significant numbers are significant.
The numbers are: 12 and 72
There are an infinite number of real numbers that multiply to get 72.