The width of a human hair is $2\ \times\ 10^{-5}$ meters. The width of a piece of sand is $1.5\ \times\ 10^{-4}$ meters.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation:

we can't see all full 4 options, but if this is the full option, than the very left one is correct:

-2/5 * -3 3/4

remake the question, adding a picture of all the question, or write down the full left and right answers.