6.3 + 5.8(4 − 3.5t) + 6.6t, when t = 2.

2.1

Step-by-step explanation:

6.3 + 5.8(4 − 3.5(2)) + 6.6(2)

6.3+5.8(4−7)+(6.6)(2)

6.3+(5.8)(−3)+(6.6)(2)

6.3+−17.4+(6.6)(2)

-11.1+(6.6)(2)

−11.1+13.2

2.1

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

$54.99

step-by-step explanation:

$54.99 includes 500 min. if she does not exceed 500 min then her bill is $54.99