Tell whether the sequence is arithmetic. If it is what is the common difference? 1, 9/10, 4/5, 7/10

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17