Suppose y varies directly as x. If y = 30 when x = 8, find y when x = 4.

y=15

Step-by-step explanation:

y=kx

30= 8k

k=15/4

y=15/4×4

y=15

3: 2

step-by-step explanation:

shorter piece is 2: 3, so just reverse it, and you get 3: 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