is this statment correct?

i now under that when doing scientific notation you see how many times u move the decimal back to get the number its negitive of such as 00000000008. is = 8x10^-9

No, the statement is not correct. In scientific notation, when converting a decimal number to scientific notation, the exponent determines the number of times the decimal point should be moved, not the sign of the number.

For example, 0.000000008 can be written in scientific notation as 8 x 10^-9 (not with a negative exponent as stated in the statement).

(2.) Write 6.2 x 10 (to the power of 7) in decimal notation. (1 point)

1 point
6.200000000
6,000,000
62,000,000
6

The decimal notation for 6.2 x 10^7 is 62,000,000.

(3.) Which of these numbers has the LEAST value? Write in Scientific Notation. 539,393 or 65,677 or 23,494 (1 point)

1 point
2.3494 x 10 (to the power of 4)
23,4940
5.39393 x 10 (to the power of 5)
65,677

In scientific notation, the number with the least value is 2.3494 x 10^4.