What is the order of 5x10^4 , 7x10^-5 , 3x10^-9 , 8x10^4 from least to greatest?

Step-by-step explanation:

We want to order ; from least to greatest.

Observe that all these numbers are in standard form.

We can order them based on the exponents.

Since two numbers have the same exponent of 4, we need to use the multiplier to order the last two(5<8).

From least to greatest we have;