What is the value of cos ^-1 (-3sqrt / 2)? a.) 5pi / 6
b.) 2pi / 3
c.) pi / 6
d.) pi / 2

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.

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?