Answer:

Step-by-step explanation:
Given:
Width of average grain of salt is, 
Width of Rhinovirus is, 
Now, expressing each width in scientific notation form, we get:

Now, in order to get how many times 'W' is wider than 'w', we divide the two widths. This gives,

Therefore, the grain of salt is
wider than Rhinovirus.
Answer:
The first two
Step-by-step explanation:
Do the parenthesis of the first and you will get the original equation.
Multiple the second with 4 and you will get the original equation too.
Answer:
h=128
Step-by-step explanation:
Do 4 1/4 - 1/4 which is easy, just take away the 1/4 and you get 4, so he used 1/4 gallons
Answer:
y = 9/b
Step-by-step explanation:
by = 9 solved for b yields y = 9/b.