What would be one similarity between "no solution" and "infinitely many solutions (all real numbers)" I know we are talking about inequalitys, but I don't know the similarity.

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

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

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?