Question

how many significant digits does 7.5 x 10^4 have?

Answer 1

notice the "4" exponential, meaning, move the decimal dot 4 slots to the right
or \(\bf 7.5 x 10^{\underline{4}} \implies 7\underline{5000}.\)

significan digits, are "interesting digits"
usually in short means, a string of zeros, on either the left side or the right side, by themselves, are not significant

so in say 000003000
has 9 numbers
but not counting the zeros on the left and right
the only significant number is really "3"

Answer 2

so in the case of 75000
it has 5 digits but
notice, the right-side has a bunch of zeros by themselves
and those are not "significant"

Answer 3

so there are 2 significant digits? @jdoe0001

Answer 4

yeap 75

Answer 5

thanks... please help with this one if you can..

Answer 6

light travels at approximately 300,00,000 meters per second. in scientific notation this would be expressed as, what? 3x10^?