10 ^ -4 = 0.0001
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28,75 million = 28.75 x 10^6 = 2875 x 10^4 = 28750000, hence there would be 4 zeros
there are 6 significant zeros. 2.50 time 10 to the negative seven 2.50 -1 power = .250 -2 = .0250 -3 = .00250 -4 = .000250 -5 = .0000250 -6 = .00000250 -7 = .000000250 the first six are significant
There are 4 zeros.
There are 4 zeros.
Twelve zeros.