The density of hydrogen is approximately 9 × 10-5 , while the density of helium is approximately 2 × 10-4 . which of the following is true? a. the density of hydrogen is approximately 20 times the density of helium. b. the density of helium is approximately 20 times the density of hydrogen. c. the density of hydrogen is approximately 2 times the density of helium. d. the density of helium is approximately 2 times the density of hydrogen.

Option D.

Step-by-step explanation:

Density of Hydrogen =

Density of Helium =

Now ratio of the densities =

=

= 0.22×

= 2.2

Density of Helium = 2× Density of Hydrogen

Therefore, density of Helium is approximately 2 times the density of Hydrogen.

Option D is the answer.

40 x 50 = 2000

step-by-step explanation:

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130