Arigid tank of air is cooled (temperature decreased) the volume has to remain constant because it is a rigid tank the air pressure in the rigid tank a. increases b. decreases c. stays the same 20 points right away

If we consider Boyles law for gases, it states the following equation,
PV/T =k
where k is a constant
P-pressure, T- temperature and V -volume
the volume is constant at both situations as its a rigid tank as mentioned in the questions.
Therefore we consider Volume to be constant , then equation is
P/T = kV
kV = c (new constant)
P/T = c
P = cT
Therefore pressure is inversely proportional to temperature, whatever change in pressure would cause the same kind of change in temperature as well.
therefore when T decreases, P also decreases.
Answer is B

Answer is trees if this doesnt try using google