Solve one from group b pls show work and steps

What is f(3) for the quadratic functionf(x)=2x2 + x – 12? f -3g 3h 6i. 9

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

What does x = in this equation x+3+2x=x+5