What is the answer that i fill in for A?

b.an increase in a causes b to decrease

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.