F(x) = 2x - 8; translation 2 units down

2x-10

Step-by-step explanation:

the -8 is it's y-intercept, so just subtract 2

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

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.