Halp please, no links or i'll report "Do you think bike helmets should be mandatory for all bike riders?"

a.) This is an example of random sampling.
b.) This is an example of biased sampling.

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl