Which equation has the solutions?

a) 3x2 – 5x + 7 = 0
b) 3x2 – 5x – 1 = 0
c) 3x2 – 10x + 6 = 0
d) 3x2 – 10x – 1 = 0

Option d is correct.

Step-by-step explanation:

We have bee given the solution which is:

Using:

And then

From the given equation we will check for D first and then we proceed because is the initial step of the solution.

Here, a=3,b= -10 and c=-1.

Substituting  the values in the formula to get the solution.

Option d is correct.

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