Add rational expression add x/x+1 + 2/x

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Macy spent $36 on jeans. this was $12 less than twice what she spent on a shirt. which equation to solve this, 12x=36 2x=36-12 2x-12=36 12-2x=36