Need
the diameter of a hydrogen atom is about 5×10^-15 meter. suppose 8.4×10^8 hydrogen atoms were arranged side by side in a straight line. multiply these numbers to find the length of this line of atoms. what is the length in scientific notation?

select one:

a. 4.2×10^−2 meter
b. 0.042 meter
c. 42×10^−3 meter
d. 4.2×10^−3meter

I'm a few years late, lol, but um the answer is 42 x meters

For all the people who still need the answer.

Step-by-step explanation:

5 x and 8.4 x

5 x 8.4 = 42  (multiply like terms)

+ =  (add the exponents)

42 x

b

step-by-step explanation:

given

- 2 (3x + 12y - 5 - 17x - 16y + 4 )

simplify the parenthesis by collecting like terms

= - 2 (- 14x - 4y - 1) ← distribute the parenthesis by - 2

= 28x + 8y + 2 → b